Wondershare PDFelement - All-in-one PDF editor
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.