Source: Control a Cooling Fan on a Raspberry Pi 3 : 9 Steps – Instructables
HOW-TO Start/Stop/Powerdown Pi with 1 Button – Raspberry Pi Forums
Raspberry Pi Shutdown/Reset/Start Button
Ultimate Guide to Connecting LED Light Strips to Arduino
FastLED LED animation library for Arduino (formerly FastSPI_LED)
(…) — Raspberry pi powerdown and powerup button
pi 3 – Raspberry Pi 3 model B “dtoverlay=gpio-shutdown” – Raspberry Pi Stack Exchange
Online Tone Generator – Free, Simple and Easy to Use.
wxPerl – Perl wtapper for the wxWidgets GUI toolkit
http://www.wxperl.it/
http://wiki.wxperl.it/