Wiggio - Wiggio is an online toolkit that makes it easy to work in groups. With Wiggio you can:
Eduflow - Digital learning that actually teaches students something
GroupSpaces - Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces
Padlet - Visual boards for organizing anything.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Flowlingo - Get fluent in a language through content immersion