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.

The Sovereign LORD is my strength; he makes my feet like the feet of a deer, he enables me to go on the heights.
-Habakkuk 3:19

Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved.
-Acts 4:12

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Godliness with contentment is great gain. For we brought nothing into the world, and we can take nothing out of it.
-1 Timothy 6:6-7

Even the woodpecker owes his success to the fact that he uses his head.