Let's make a list of ideal SaaS offerings which can be compelling alternatives to Google Apps/Docs, 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 FOSS 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-FOSS editions or services but they are not the target of this list
• Pay with a credit card or PayPal
• They are contributors to the FOSS 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)

The list

• WordPress
• Acquia Gardens (Drupal)
• SugarCRM
• StatusNet
• Kaltura
• Wikia A heavily modified version of MediaWiki
• XWiki
• vtiger on demand
• Alfresco
• ownCloud
• MindTouch

Almost there

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

• TWiki (can't register via credit card)

Related:

• Hosting company
• http://suite.tiki.org/Tiki+Suite+SaaS