Open Source C Graphing Calculators

TILP (formerly GtkTiLink) can transfer data between Texas Instruments graphing calculators and a computer. It works with all link cables (parallel, serial, Black/Gray/Silver/Direct Link) and it supports the TI-Z80 series (73..86), the TI-eZ80 series (83PCE, 84+CE), the TI-68k series (89, 92, 92+, V200, 89T) and the Nspire series (Nspire Clickpad / Touchpad / CX, both CAS and non-CAS). The project is now managed on Github, https://github.com/debrouxl/tilp_and_gfm . It uses the libti* libraries, https://github.com/debrouxl/tilibs . Install script for *nix: https://github.com/debrouxl/tilp_and_gfm/blob/master/tilp/trunk/build/scripts/install_tilp.sh

Scientific calculator for PalmOS and PocketPC with graphing, financial operations, number conversions, complex numbers and much more.

The Revolution-FX project goal is to provide the best platform for developing applications for the CASIO fx-9860G graphing calculator. Revolution-FX components include addheader, code editor, a hardware library, and works with the GNU toolchain.

A linux calculator which maintains the option of the simple text-based experience of bc while adding features like function declaration, registers, and a gtk+2.0 GUI. There are many predefined functions and constants. Graphing is one of many future plans.

Quicksolve is an interactive graphing calculator and programming language. It provides an intuitive interface for performing basic plots and calculations with a focus on numerical solutions. Versions will be available for both Gnome and Mac OS X.

TI83dk is a set of tools and a library to allow users to cross-compile to the TI-83 graphing calculator using the open source SDCC compiler