Free C source code:

dlib.c    - a collection of useful c functions
dcurses.c - a collection of c curses functions
dcalc.c   - an onscreen curses based calculator
ddump.c   - an onscreen curses based hex dump file viewer
dtype.c   - an onscreen curses based file viewer
dr.c      - a curses based directory listing utility

Here's an experimental program for study:
dzip.c    - a file compression program

Arduino attiny85 C source code:

Music out of attiny85 pb0:
music.ino    - Fugue in G Minor, J.S. Bach

This code is made freely available under the terms of the GPL.

NULLAM PARTEM HABEMUS.
We have no part (in it).

The day is the same length as anything that is the same length as it
-Lewis Carroll

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The heart of the fool is in his mouth, but the mouth of the wise is in his heart.
-Benjamin Franklin

MUTATIS MUTANDIS.
What was to be changed having been changed.