KMyMoney is the Personal Finance Manager for KDE. It operates similar to Quicken, supports various account types, categorization of expenses, multiple currencies, online banking support via QIF, OFX and HBCI, budgeting and a rich set of reports.
Free open source ERP, accounting, CRM package for small to midsized businesses. Runs on Linux, Mac, and Windows (built with open source Qt framework). Business logic resides in PostgreSQL database....