Open Systems Accounting Software (OSAS) is an accounting and business management system. It is designed to be easy to learn and use. It is best suited for companies ranging in size from small companies with 12 users or less to mid-market companies. It comes with many modules for accounting, distribution, and reporting.
Abstract provides a basic flow-based accounting model. It supports processing of multiple economic resources. It automatically calculates the value of accounting transactions given information on resource transfers. This also includes automatic revenue recognition and profit/loss calculation on a per-transaction basis.
avsap is a powerful, flexible, and complete financial accounting package. It supports double entry book keeping, cash and bank books, ledger, journal, customizable chart of accounts, template voucher entry, custom reports, year closure, customizable financial years, and multiple login levels. It is multi-user out of the box, acid compliant, fast, and user friendly.
SAGU, which is a portuguese acronym for "Sistema Aberto de Gestão Unificada", was originaly designed to automate all of what that happens between a student and their Educational Institution. This relationship happens at the academic, financial and administrative levels, and SAGU has subsystems dedicated to these levels. SAGU can be tailored to fit the needs of any Educational Institution.
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.
ISPacct (formerly Brickacct) accounts the logfiles which Bintec routers spew out depending upon configurable rules. Logfile-analyzing mail accounting functionality is also included (in beta stage). It has multiple backends like text, HTML, and MySQL. It was designed and used by a small ISP and is geared towards such uses as monthly accounting per IP or per dial-in use.