SideProjects - A platform to share side projects you're working on
Hygger - Hygger - is an Agile project management tool with built-in prioritization.
The Tyk Side Project Program - Apply for a micro-grant for your side project
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.
Transferslot - Easily buy and sell side-projects
Validated ideas - List of 5,000 poorly executed but popular apps