Github exists for coders, people are massaging it for other projects. Crowdsourcing platforms are many but each have their faults.
I am building a platform for anyone to contribute to projects.
We are disrupting the future of work. PLease check out
www.crowdraising.co/metacampaign
and there is an explainer video that does the job
https://www.youtube.com/watch?v=w3QT4lqco8M