Open Source C# Communications Software - Page 4

C# Communications Software

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Browse free open source C# Communications Software and projects below. Use the toggles on the left to filter open source C# Communications Software by OS, license, language, programming language, and project status.

  • Field Sales+ for MS Dynamics 365 and Salesforce Icon
    Field Sales+ for MS Dynamics 365 and Salesforce

    Maximize your sales performance on the go.

    Bring Dynamics 365 and Salesforce wherever you go with Resco’s solution. With powerful offline features and reliable data syncing, your team can access CRM data on mobile devices anytime, anywhere. This saves time, cuts errors, and speeds up customer visits.
    Learn More
  • Failed Payment Recovery for Subscription Businesses Icon
    Failed Payment Recovery for Subscription Businesses

    For subscription companies searching for a failed payment recovery solution to grow revenue, and retain customers.

    FlexPay’s innovative platform uses multiple technologies to achieve the highest number of retained customers, resulting in reduced involuntary churn, longer life span after recovery, and higher revenue. Leading brands like LegalZoom, Hooked on Phonics, and ClinicSense trust FlexPay to recover failed payments, reduce churn, and increase customer lifetime value.
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  • 1
    SipLine

    SipLine

    Free, native Windows SIP softphone with HD audio, SRTP encryption

    SipLine is a modern, lightweight SIP softphone for Windows 10/11 built with .NET 9 WPF. It provides enterprise-grade VoIP communication with a focus on performance, security, and extensibility. Features Ultra-Fast: Startup in <0.5s, minimal CPU usage HD Audio: Opus and G.711 codecs with adaptive jitter buffer Security: TLS transport, SDES-SRTP encryption, Windows DPAPI credential protection Multi-Account: Up to 5 simultaneous SIP accounts Plugin SDK: C# SDK for custom integrations (CRM, call recording, automation) Plugin Marketplace: Community and premium extensions Headset Support: Jabra, Poly, Sennheiser, Logitech with HID controls Call Quality: Real-time MOS Score, Jitter, Packet Loss and RTT monitoring Enterprise: Silent MSI installer, GPO support, JSON centralized config Compatibility: 3CX, Asterisk, FreePBX, OVH, Twilio, RingCentral, and more Language packages : https://sipline.feelautom.fr/languages
    Downloads: 5 This Week
    Last Update:
    See Project
  • 2
    xmelee is an xbox peer-to-peer tunneling program. It enables lan games (system link) to be played over the internet. The packetization is highly optimized which permits the lowest lag possible when extending game play over the internet.
    Downloads: 5 This Week
    Last Update:
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  • 3
    OfficeSIP Softphone and Messenger
    OfficeSIP Softphone and Messenger are two enterprise VoIP SIP clients written in C# in .NET Framework. The SIP clients make use of Microsoft UCC API SDK, ensuring the highest quality of audio and video. Compatible with Office Communications Server. See also open source, cross-platform: 1) simple messenger Brief Msg at http://briefmsg.org 2) MUVConf is a multi-user video conferencing, see demo video http://youtu.be/YrBU-Aqtvrk, download https://code.google.com/p/muvconf/downloads/list
    Downloads: 2 This Week
    Last Update:
    See Project
  • 4
    Next generation web-based, multi-tenant, distributed, mulit-lingual, inbound, outbound Video enabled VoIP & VVoIP call/ contact center solution for Asterisk with Built-in phone, IVR, CRM, Predictive dialer, ACD, Chat, Mail, Fax, Video and other features.
    Downloads: 4 This Week
    Last Update:
    See Project
  • Data management solutions for confident marketing Icon
    Data management solutions for confident marketing

    For companies wanting a complete Data Management solution that is native to Salesforce

    Verify, deduplicate, manipulate, and assign records automatically to keep your CRM data accurate, complete, and ready for business.
    Learn More
  • 5
    Driver support for 3D Controller Hardware. We hope to support SDL Input, DirectInput, and other major controller API's including game consoles and embedded systems.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 6
    An open Gnutella network library based on GnucDNA. It is platform-independent, developer-friendly and efficient, developed in portable C++. Easy enough for the casual P2P developer and advanced enough to satisfy the research project needs.
    Downloads: 4 This Week
    Last Update:
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  • 7
    NHashcash is a .NET implementation of the Hashcash denial-of-service counter-measure mechanism.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 8
    ProjectPortal is a multi-lingual, multi-user web-based groupware suite for programme & projectmanagement written in Visual C# ASP.NET using MS Access, MS SQL/MSDE, Oracle or MySQL for datastorage.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 9
    QuatView

    QuatView

    Quaternion Viewer and Converter

    Quaternion conversion and visualization program for Windows. Includes 3D OpenGl graphics, real-time quaternion file playback, and a server to receive and display quaternion data from remote computers via TCP. Also displays Euler angles and DCM.
    Downloads: 4 This Week
    Last Update:
    See Project
  • SoftCo: Enterprise Invoice and P2P Automation Software Icon
    SoftCo: Enterprise Invoice and P2P Automation Software

    For companies that process over 20,000 invoices per year

    SoftCo Accounts Payable Automation processes all PO and non-PO supplier invoices electronically from capture and matching through to invoice approval and query management. SoftCoAP delivers unparalleled touchless automation by embedding AI across matching, coding, routing, and exception handling to minimize the number of supplier invoices requiring manual intervention. The result is 89% processing savings, supported by a context-aware AI Assistant that helps users understand exceptions, answer questions, and take the right action faster.
    Learn More
  • 10
    This is simple app that can download files from some folder to rapidShare. Project is very simple now.
    Downloads: 4 This Week
    Last Update:
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  • 11
    eAnt is a P2P App written in C# (currently only for .NET Framework, but soon also for Mono) for files exchange. eAnt uses the same network used by eD2k/eMule clients. Inactive since 26/12/2005. Rest in peace eAnt.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 12
    Windows 7 MediaCenter Plugins ArgusTV MediaCenter Client is a Open Source WindowsMedia Center Client for ArgusTV with this can you view hear Tv or hear Radio Streams ,view delete Recordings from ArgusTV Backend Service or manage Schedules more Informations are avaible in our Wiki SimpleRadio is a OpenSource Windows MediaCenter Addin that allows you hear Web Radio Streams more Informations are avaible in our Wiki
    Downloads: 4 This Week
    Last Update:
    See Project
  • 13
    MyTvShowOrganizer

    MyTvShowOrganizer

    Tv-Organizer & Torrent Episodes Downloader V.2025.06.02

    OpenSource Application which has a Complete set of Tools to organize, get info and Download torrents of Tv-Series. STATUS: STABLE. NEW REQUIREMENTS: .WINDOWS 10 64 bit or above; .FIREFOX x64 installed and ready to deal with Torrent and Magnet Links. Test firefox at www.limetorrents.lol before installing https://www.mozilla.org/en-US/firefox/all/#product-desktop-release .UTORRENT or Similar Torrent Client. How: It gets the TV-Show name, episode, resolution, plus any KeyWord to filter the results, eg: DD5 (must have DD5); -HEVC (must not have); DD5|6CH (one OR other). It searches WEB at the chosen torrent indexer ( limetorrents, idope..). Then the torrent for the most seeded which matches user criteria is sent to Utorrent. Other OS: Need to install virtual copy of Windows. See: http://dev.modern.ie/tools/vms/ and https://www.virtualbox.org/ Do not be a Pirate! SUPPORT Tv-Series Producers! SUBSCRIBE to a Web media streamer like Netflix to get legal access
    Downloads: 1 This Week
    Last Update:
    See Project
  • 14

    GO Contact Sync

    Project superseded by http://sf.net/projects/googlesyncmod

    GO Contact Sync is a tool that synchronizes your contacts between Microsoft Outlook and Google Mail, it removes the hassle of entering details more than once. This project is superseded by http://sourceforge.net/projects/googlesyncmod
    Downloads: 1 This Week
    Last Update:
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  • 15
    Downloads: 2 This Week
    Last Update:
    See Project
  • 16
    ShowMyScreen
    Simple and portable screen sharing utility. No software required for the client as the shared screen is displayed through a password-protected web page in any browser.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 17
    Thresher is a .Net IRC client library designed to serve as the basis for IRC bots and GUI clients. It is written in C# but can be used by any .Net supported language. Thesher also works with Mono on Linux.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 18
    It is an email sender. This software can send your mass marketing bulk email to unlimited mailing list. The program can send via SMTP server, MAPI, or delivers e-mail directly without ISP's mail system. Also includes flexible address filters and rules.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 19
    AVAYA CMS API Server

    AVAYA CMS API Server

    CMS API Server with web site

    Free version of AVREMO.CMS.API exposing REST Services. With this software you can browse for all CMS reports. Design a report with AVAYA CMS Supervisor designer, application automatically expose data as XML or JSON. You can also browse reports with your preferred browser (desktop or mobile) and execute CMS operations like modify dictionaries, modify agent skills, modify VDN/Vector associations and more. Application package include : - A responsive WEB server interface (compatible with mobile browsers) to browse reports, perform CMS Operations and Agent Skill modification from any device having a browser. - Full Documentation - The server application, including administration GUI - Dashboard : a .NET consumer, used to test server and get REST URLs - CMS Operations (modify Dictionaries, Call Center Administration, etc) - Agent skill modification. - Basic security.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 20
    AnimeMonitor is a C# gui application that monitors RSS feeds of torrent files and allow for downloading and auto-launching the assoc. torrent app to handle the torrent file downloaded.
    Downloads: 3 This Week
    Last Update:
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  • 21
    Astryx

    Astryx

    High-performance Windows downloader with a real-time local Web UI

    Astryx is a high-performance, Windows-native downloader with a real-time local Web UI. It prioritizes sustained throughput, reliability, and predictable behavior over burst scraping. The backend and UI run locally, providing live visibility into throughput, host health, and download state. The project is independently developed and released publicly as an early v0.x build. Keywords: Windows downloader, high-throughput, HTTP, local Web UI
    Downloads: 3 This Week
    Last Update:
    See Project
  • 22
    ByteSync

    ByteSync

    All-in-One Sync, Backup & Deduplication Tool

    ByteSync is a powerful open-source tool for remote file comparison and synchronization, designed to transfer only what truly matters: the differences. Whether you're syncing large files, backing up remote folders, or handling extensive sets of small files, ByteSync delivers speed, security, and efficiency—without unnecessary data transfers. Compatible with Windows, macOS, and Linux, ByteSync leverages cloud-based orchestration with end-to-end encryption, eliminating the need for VPNs or firewall configurations. No continuous background syncing, no bloat—just fast, on-demand file synchronization between remote devices.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 23
    DB Web Admin Provides access to your databases through a web interface. It gives users visibility into their SQL Server database instances. DBWA shows users Currently running SQL Queries, Historic Queries, and Fragmented Indexes. DBWA also allows users to kill currently running queries or run their own SQL queries. DBWA is implemented in ASP.NET MVC using C#. Previous Versions supported Oracle(PL/SQL and JSP), MS SQLServer (ASP), and MySQL/ODBC (C#.NET) versions.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 24
    Desktop Contacts aims to provide a lightweight, always on top set of tabs at the top of the screen that, when clicked, displays an editable contact list and quick notes. The project is written in VB.Net 2.0 and C# 2.0 (ExtendedRichTextBox control).
    Downloads: 3 This Week
    Last Update:
    See Project
  • 25

    Free135

    A free utility suite for the PRO-135 scanner.

    The goal of the Free135 project is to create a suite of free scanner programming software for the RadioShack PRO-135 police scanner radio (catalog number 20-135) using the RadioShack USB/Scanner PC Interface Cable (catalog number 20-047). This is a very early, quick, and dirty release. There may be bugs and the code could definitely be optimized.
    Downloads: 3 This Week
    Last Update:
    See Project
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