MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
FileInvite - Stop chasing your clients for documents! Easily request files, documents, forms & signatures from your clients – set a due date and save hours as your requests are returned to you effortlessly.
TiddlyWiki - a non-linear personal web notebook
Clinked - White-label Client and Team Workspace
Confluence - Confluence is content collaboration software that changes how modern teams work
iDeals Virtual Data Room - iDeals Virtual Data Room is a tool that provides secure access to large amount of confidential documents and can view, analyze and collaborate in a protected environment.