There are two different websites which aim at collecting such efforts and sharing them with everyone (with filters!):
https://www.makingallvoicescount.org/ (archived until 2017) Making All Voices Count collected and analyzed citizen initiatives to promote transparency, fight corruption, empower citizens, and harness the power of new technologies to make government more effective and accountable.
https://participedia.net/ A global community sharing knowledge and stories about public participation and democratic innovations.
Enjoy and get inspired!