Mobilizon - A free and federated tool to get our events off Facebook

craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Facebook Marketplace - Marketplace is a convenient destination on Facebook to discover, buy and sell items with people in your community.

DownToMeet - DownToMeet is a platform to organize, find, and attend group events.

Bedpage - Bedpage is a classified ad posting a website that comes as the alternative to Backpage and offers almost all the major services to post for multiple categories.