Certiflex Dimension 
This second generation Windows solution is an interactive accounting system designed for the professional accountant responsible for client review, reporting and auditing.
http://www.clientwrite-up.com/Howell Client Accounting
Offers client accounting program for Windows and DOS. Features trial download and support information.
http://www.howellsoftware.com/
Proacc
Software for accountants in practice.
http://www.proacc.co.uk/
PC Software Accounting, Inc.
Windows based software for accounting firms.
http://www.pcsai.com/
Sana Software Inc.
Multi-client accounting system for CPAs and accounting professionals.
http://www.sana.cc/
OK Accounting Systems and Software
Download free demonstration of CPA Client software, tour screen shots, features, FAQs.
http://jove.prohosting.com/oasys/
Creative Solutions Client Write up
System that includes after the fact payroll. Modules such as bank rec, live payroll, and asset depreciation are add-ons.
http://www.creativesolutions.thomson.com/write-up/
