Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Rust - A safe, concurrent, practical language
Synfig Studio - Just another WordPress site
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
Blender - Blender is the open source, cross platform suite of tools for 3D creation.