Drawpile is a drawing program that lets you draw, paint and animate together with others on the same canvas. It runs on Windows, Linux, macOS and Android. Take a look at the downloads page on drawpile ...

Here, all the data structures accessed by the C/C++ codes are allocated on the "C-side" by (carefully) using "malloc/new." Valgrind is employed to make sure that there are no leaks (hopefully). It ...