Teamleader - CRM, invoicing & project planning in a single tool for SME's
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
FreshBooks - The ideal accounting software for small business owners.
Xero - Xero is online accounting for your small business.
InvoiceLion.com - Web based open source time management and invoicing software
CheckStream - CheckStream check printing software