AceMoney Lite Version (Single User) is just the thing for your small business or personal finances.
AceMoney works well under Linux with Wine
Personal and small-business financial-accounting software, freely licensed under the GNU GPL - Windows, Mac OS X and Linux.
PLCash is a platform-independent personal finance program. Runs on Windows, Mac OS X and Linux. NB: PLCash needs Java to run.
Jar file for Mac OS X and Linux