Sandstorm Software

Wekan, formerly LibreBoard, is an open-source and collaborative Trello -like kanban board application.

MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis.

Etherpad is a highly customizable Open Source online editor providing collaborative editing in really real-time.

EtherCalc is a web spreadsheet. Your data is saved on the web, and people can edit the same document at the same time. Everybody's changes are instantly reflected on all screens. Work together on inventories, survey forms, list management, brainstorming sessions and more!

MediaGoblin is a free software media publishing platform that anyone can run. You can think of it as a decentralized alternative to Flickr, YouTube, SoundCloud, etc.

A community forum allows you to engage and retain customers, keeping them interested and up-to-date with your latest product or service.

permanote - A note-taking application for Sandstorm