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:

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

     timedOff.ino - Very low idle power (quiescent) PIR interrupt driven timed night light:
     Instructable: Attiny85-AVR-Arduino-PIR-Triggered-Timed-Night-Light

     hauntedHouse.ino - Light effects for a Halloween model using the two PWM pins plus a third pin:
     Instructable: Attiny85-AVR-PWM-Haunted-House-Model-LED-Lights
     Youtube: Testing Circuit and Software
     Youtube: Final Results

Arduino atmega328p:

Halloween sound effects prototype:
     halloween.ino - PIR triggered halloween sound effects
     Instructable: ATmega328p-Arduino-Halloween-Sound-Effects-Prototype
     Youtube: One minute demo video
     Youtube: Illuminated with motion
     Youtube: In the dark with motion and sound

Instructable: Atmega328-Programming-Boards

Arduino attiny84:

Stepper Motor Control:
     stepperMotor.ino - Interrrupt driven stepper motor control

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

LEX MALA, LEX NULLA.
A bad law (is) no law.
-St. Thomas Aquinas

MUSICA DONUM DEI.
Music, the gift of God.
-Motto on a harpsichord

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LEX COMMUNIS OMNIUM.
The common law of all

FACTUS EST DEUS HOMO, UT HOMO FIERET DEUS.
God was made a man in order that man might become God.
-St. Augustine