SaaS Client Accounting Tools

I’m working on a project related to SaaS Client Accounting tools, and would like to update some product listings related to this category.  A few questions for you, the gentle reader, about these apps:

1. Are there any other solutions which I should be listing?

2. Do you have any experience (good, bad, or ugly) with any of the products?  How would you describe your experience, as well as how would you categorize the product within the SaaS accounting tools category?

3. Are you aware of any US accountant programs for the applications?

SaaS Client Accounting Tools