FreeLists
FreeLists provides the internet community with Free, no-hassle, high-quality mailing lists
21 Alternatives To FreeLists
Basecamp
A simple and elegant project management system. Basecamp is more than just a project management tool — it’s a better way to work. Teams that switch to Basecamp are more productive and better organized.
Eventbrite
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
GroupSpaces
Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces
Librelist
Librelist is a free as in freedom mailing list site for open source projects
Mailman
Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Meetup
Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Trello
Infinitely flexible. Incredibly easy to use. Great mobile apps. It’s free. Trello keeps track of everything, from the big picture to the minute details.