Here the non exhaustive list of all independant game contests & Jams: UPDATE: 03/01/2015
Contests:
- Indie Prize @ Casual Connect: http://www.indieprize.org/ 4 time per year (may, july, october, february)
- Indie Cade: http://www.indiecade.com/submissions/ (Submissions: February)
- IGF: Independant Game Festival http://www.igf.com/ (Submissions: September-October)
- EIGD: European Indie Game Days http://www.eigd.org/ (Submissions: September)
- Kongregate: http://www.kongregate.com/contests (Monthly and Weekly contests)
- Imagine Cup: https://www.imaginecup.com/ (Submissions: January to July)
- Flash Game License: Look on website
IGC: Indie Game Challenge http://www.indiegamechallenge.com/(down)IndiePubGames: http://www.indiepubgames.com/contest.php(down)
Showcases:
EDIT: All showcases http://www.promoterapp.com/calendar
- Casual Connect: Indie Prize showcase
- PocketGamerConnect: I Love Indie showcase
Festivals:
- Radius Festival
- Festival International des jeux de Cannes
Jams:
EDIT (02/12/2014): you can find all jams here: http://compohub.net
- Ludum Dare: http://www.ludumdare.com/compo/about-ludum-dare/ (December, april, august)
- Global Game Jam: http://globalgamejam.org/ (January)
- FGL.com – FlashGameLicence.com (Every month) : Forum post
HTML5 Game Jam: http://html5gamejam.org/(down)
Please comment and send feedback to update this list ;).