Accounting
AceMoney Lite
AceMoney Lite Version (Single User) is just the thing for your small business or personal finances.
AceMoney works well under Linux with Wine
http://www.mechcad.net/products/acemoney/index_lite.html
http://www.mechcad.net/downloads/AceMoneyLiteSetup.exe
GnuCash
Personal and small-business financial-accounting software, freely licensed under the GNU GPL - Windows, Mac OS X and Linux.
www.gnucash.org
PLCash
PLCash is a platform-independent personal finance program. Runs on Windows, Mac OS X and Linux.
http://www.arachnoid.com/PLCash/index.html
Windows
http://www.arachnoid.com/PLCash/PLCash.exe
Jar file for Mac OS X and Linux
http://www.arachnoid.com/PLCash/PLCash.jar
NB: PLCash needs at least v1.4 of Sun's Java runtime to run.
http://www.java.com/en/download/installed.jsp
TurboCASH
TurboCASH's Free multiuser accounting software
http://www.turbocash.net/
http://www.turbocash.net/index.php/download-tubocash