"calendar" generates a giant calendar for a full Gregorian cycle of 400 years.
It writes to the standard output.
Its source code (not very polished!) is in "~/misc/src/calendar/calendar.c".

"dbparse" parses, as best it can, a Netscape-style database file.
It writes to the standard output.
Its source code (not very polished!) is in "~/misc/src/dbparse/dbparse.c".

"gravity" is my little Runge-Kutta gravity simulation.
Its source code is in "~/misc/src/gravity/".