The Visualization Toolkit (VTK) is an open-source software system for 3D computer graphics, image processing, and visualization.

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

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

Lazarus is an IDE to create (graphical and console) applications with Free Pascal, the (L)GPLed Pascal and Object Pascal compiler that runs on Windows, Linux, Mac OS X, FreeBSD and more.

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

Botan is a C++ library which provides support for many common cryptographic operations, including encryption, authentication, and X.509v3 certificates and CRLs. A wide variety of algorithms is supported, including RSA, DSA, DES, AES, MD5, and SHA-1.