@Shufei I'm building public feedback systems that interact with map data, for city planning and transportation orgs. #QGIS is kinda the "swiss-army knife" of mapping warez.
I've kinda been processing the #awesome #GIS #lists:
https://talkgroup.xyz/t/process-awesome-gis/3963
You can put .rss at the end of that URL to subscribe. Working my way through to get a sense of the #free #GISwarez. ^_^