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.

Unless you expect the unexpected you will never find truth, for it is hard to discover and hard to attain
-Heraclitus

We are going to have peace even if we have to fight for it.
-Dwight D. Eisenhower

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QUAM TERRIBILIS EST HAEC HORA.
How fearful is this hour.

When I was younger, I could remember anything, whether it had happened or not.
-Mark Twain