Choqok - Open Source micro blogging tool

Choqok is a Free/Open Source micro-blogging client for K Desktop Environment. This open source micro blogging tool supports some of the well known platforms like Twitter.com, Identi.ca micro-blogging service, self hosted StatusNet websites, Open Collaboration Services API (Used by opendesktop.org) and you can send and receive direct messages.

GAP

Open Source Algebraic Computation

GAP is - short for Groups, Algorithms, Programming - an algebraic computation system, i.e. a system for computational discrete algebra. Its main focus is on computational group theory. GAP includes its own programming language, as well as large data libraries of algebraic objects.

Kig

Open source geometry software

Kig is free and open source interactive geometry software, which is part of the KDE edutainment project. It has some facilities for scripting in Python, as well as the creating macros from existing constructions.

GeoGebra

Open source mathematics application

GeoGebra is an interactive geometry, algebra, and calculus application, intended for teachers and students. Most parts of GeoGebra are free software. GeoGebra is written in Java and thus available for multiple platforms. Many parts of GeoGebra have been ported to HTML5 by using the Google Web Toolkit.