2025 Update: 

I built a directory of project ideas along similar lines to this post. It's called Oasis of Ideas and have seen decent traction with it – people submit ideas, people also browse it to find ideas, and people also discuss the ideas.

2025 Update: 

I built such a directory. It's called Oasis of Ideas and have seen decent traction with it – people submit ideas, people also browse it to find ideas, and people also discuss the ideas. 

I would love to connect with anyone who's interested to see how we can further develop and make this a success. Specifically, would love any introductions to organisations that can help spread the word about the platform and also anyone who might be able to help me get funding.