MediBang Paint is a lightweight software for illustration and making comic books on Windows and Mac OS.
PiTiVi is an open source non-linear video editor, written in Python and based on GStreamer and GTK+.
The Collaborative Computational Notebook Built for Modern Engineering. Enter math as it appears on paper, get instantaneous results, and share your calculations with colleagues and clients. No special syntax, no software, no headaches, no kidding.