Let's make a list of ideal SaaS offerings which can be compelling alternatives to Google Apps/Docs, Microsoft Office 365, Zoho, Basecamp, etc.

Criteria to be on this list

Essential

• To offer application support
  • Not shared hosting or just firing up a VM with the app
  • They'll ideally fix reported bugs, but at the very least verify them and track for resolution
• They handle upgrades
• Possible to migrate to the FLOSS version
  • SaaS version must available for download (so you can move your data if needed)
  • Upfront explanations on how to do this, and any costs involved.
• Uses an OSI license. It's OK to have additional non-FLOSS editions or services but they are not the target of this list
• Pay with a credit card or PayPal
• They are contributors to the FLOSS project
  • So by purchasing their services, you are indirectly helping the project

Nice to have

• A free trial version (ex.: 30 days)
• Multiple vendors (so you could move from one to another)
• Public and predictable pricing (ex.: Monthly fee per user, when applicable)
• An apparent business model so we can be reassured that it is a sustainable model (Freemium is OK)
• An open development process (public source repository, open contribution policy, etc.)
• Browser-based for quick access (if apps need to be installed, they should be cross platform)

The A-list

If a provider is almost there, please add on this list with a note of what they can improve.

• Kolab
  • With Class A terms of service
  • http://kolab.org/blog/grote/2014/03/26/how-kolab-using-open-standards-interoperability
  • https://kolab.org/blog/greve/2013/08/09/mykolab.com-building-open-source-cloud-service-was-missing
• https://otalk.im/ and http://otalk.org/
  • https://www.openhub.net/p/otalk
  • https://talky.io/
• WordPress
• TeamLab
• Acquia Gardens (Drupal)
• SugarCRM
• StatusNet
• Piwik
• Kaltura
• Wikia A heavily modified version of MediaWiki
• XWiki
• vtiger on demand
• Zimbra (Many providers)
• Zarafa (Many providers)
• Alfresco
• ownCloud
• VanillaForums.com and VanillaForums.org

Almost there

• BigBlueButton (can't register & pay online)

The ex-list

• Socialtext
  • Unfortunately, the Open Source release of Socialtext is no longer supported.
• MindTouch
  • Now SaaS only
• TWiki Can't register via credit card

Related:

• http://libreprojects.net/ A great list!
• Hosting company
• http://suite.tiki.org/Tiki+Suite+SaaS
• http://www.osbf.eu/global/news_and_events/detailed_view/datum/2011/08/09/open-source-governance-index/
• http://williamjudd.com/2011/01/28/the-threat-of-saas-to-open-source/
• http://www.datamation.com/osrc/article.php/3914336/50-Open-Source-Apps-You-Can-Use-in-the-Cloud.htm

• FOSS SaaS