freeDiameter is a framework in C for supporting the Diameter Base Protocol (RFC3588). Diameter is a protocol for authentication, authorization, and accounting; it is the successor of RADIUS. Applications can be loaded as modules. Example applications include a Diameter EAP server, a Diameter SIP server, and Diameter Accounting.
iFreeBudget is a finance and budget tracking tool for those with limited or no accounting experience. You can use it to manage expenses and track account balances, generate reports, create and save complex filters to search the transaction history, create charts and graphs for assets, liabilities, and daily net worth tracking, view stock prices/quotes, store contacts, email, and phone numbers, and import OFX data for banks and credit cards. It supports the latest Quicken format, and also supports downloading current statement for bank and credit card accounts.
iTramp is a small personal accounting application. It presently supports multiple accounts, transaction types (cheque, CB, etc.), categories and sub-categories, transfer between accounts, a scheduler to save periodic transactions, basic search and statistics functions, and QIF import.
jGnash is a personal finance application written in Java. Java 7 is required. jGnash supports several account types, including investment accounts. It has support for split transactions, nested accounts, scheduled transactions, commodities, and currencies. It can import OFX and QIF files, excluding investment accounts and transactions. Data is stored in an XML format so it is easy to manipulate and read the data external to the program. jGnash also has scripting support to add custom reports and functionality.
kivitendo, formerly known as Lx-Office, is a Web-based accounting system tailored for the German market (e.g., tax calculation). It can export accounting data in the German DATEV format and features invoicing, sales orders, quotes, etc. Forms are generated on the fly as PDF or OpenDocument documents.