Hacking on the advanced open source computer algebra system -- FriCAS, which has a long history that dates back to 1965. It has not aged very well: 108 C files has been edited only 66 times in the past decade, and full of compiler warnings; its help system is written in Xlib with a style of 1990s; there are many FIXMEs written 20 years ago.

Ray will help me on improving the C part, and I will try to refactor the user interface to build a modern one.