The accelerate77.net/map was built using Google Fusion Tables. This free technology allowed for collaborative data entry and maintenance. The original team wanted to host on GIS, which while an extremely sophisticated tool, it also has a steep learning curve.
Google Fusion Tables was the best option for a small, collaboratively run nonprofit. I presented this technology at numerous conferences including the Sharing Approaches that Work (2012) and GreenTown (2013). My mapping solution and database, designed to help community-based sustainability initiatives connect with each other, won the Delta Emerging Leaders Boost Award. Unfortunately, Google depreciated Fusion Tables at the end of 2019. I am currently in the process of making a new mapping database.