Pystickynote - Stickynotes for your desktop easily from the command line.
Memo - Sticky Notes - Memo is a simple and elegant app for quickly jotting down notes on your Mac.
Stickies - Stickies is a PC utility written to replace Post-It-style notes left stuck to your monitor.
KingSumo - Grow your audience with viral giveaways that cut marketing costs
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Vov Sticky Notes - Add digital stickers to your desktop and create reminders for your upcoming events, tasks or meetings using this intuitive software.