Fabasoft Folio Cloud offers a cloud based niche direct competition to SharePoint Office 365.
You can test Fabasoft Folio Cloud for free by registering for an account. Give it a try at https://folio.fabasoft.com The site has the advantage of being free up to 1 GB of free storage so you can give it a try to see if it works for you. I will be playing with this and see how it compares to Google Docs. I have been a Google Docs users for about 4 years now ad have a love/hate relationship with the product. So it will be interesting to see how Fabasoft.
Warning, Fabasoft has a lurker site called Fabsoft. Make sure you type in FABASOFT and not FABSOFT. Even the url folio.fabsoft.com will take you to another companies site.