Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets that provide standard GUI functionality.

This is the GNU Modula-2 compiler, which compiles Modula-2 on platforms supported by gcc. It uses the gcc backend to generate optimised code.

OATH Toolkit provide components to build one-time password authentication systems. It contains shared C libraries, command line tools and a PAM module. Supported technologies include the event-based HOTP algorithm (RFC 4226), the time-based TOTP algorithm (RFC 6238), and Portable Symmetric Key Container (PSKC, RFC 6030) to manage secret key data. OATH stands for Open AuTHentication, which is the organization that specify the algorithms.

This is the GNU D compiler, which compiles D on platforms supported by gcc. It uses the gcc backend to generate optimised code.

This is the GNU Objective-C++ compiler, which compiles Objective-C++ on platforms supported by the gcc compiler.

Normaliz is an open source tool for computations in affine monoids, vector configurations, lattice polytopes, and rational cones. Normaliz also computes algebraic polyhedra, i.e., polyhedra defined over real algebraic extensions of Q.