GNU Radius is a RADIUS server and an accompanying set of monitoring utilities. It features MySQL and PostgreSQL interfaces for authentication and/or logging (the ODBC interface allows you to use almost any existing DBMS for that purpose), the ability to rewrite RADIUS requests from various NASs to normalize them to a more understandable format, and the ability to completely customize the behavior of RADIUS authentication and accounting based on NAS and user attributes.
cclite is a lightweight implementation of a community currency registry for local exchange trading systems (LETS) and other alternative money systems. It uses multi-registry, multi-currency, Web-services-based (SOAP) transactions, and is templated to give multi-lingual properties. As of 2009, it has an SMS interface and versions for Debian, cpanel-based, Fedora and Windows XP. As of 2012 it has decimal currencies, templates for many languages, and a REST-style interface for integration with CMS and social networking software.
ipt-netflow is high performance NetFlow exporting module for Linux kernel (up to 3.x). It is designed for Linux router with heavy network load. This is netfilter/iptables module adding support for NETFLOW target. It is designed to work without conntrack. It supports NetFlow protocols versions 5, 9, and IPFIX. It has accounting for IPv4, IPv6 traffic, and (NEL) NAT translation events.
Famflows is a program which tracks "flows" of energy and materials inside a household. It has an alternative approach from double entry accounting systems. In those systems (like gnucash or jgnash), the transactions are balanced in numeric value. In famflows, instead, the transactions are balanced in the conversion, but not in the numeric value.
Jledger is a Java Business Accounting API that consists of invoicing, general ledger, stock/inventory control, and other business APIs that will assist Java developers in building business software with ease. It will take care of the business logic like accounting double entry, Stock Balance and management (FIFO), etc., and seamlessly integrate each part of business operation as a whole.
VATStuff provides a double-entry bookkeeping system with facilities to create purchase orders and invoices and to record costs and calculate VAT returns. VAT calculations are designed to meet UK regulations, and are not applicable to other states. Even for non-VAT registered companies, VATStuff enables you to record your transactions and produce invoices.
StratosERP is a module set that allows you to use Drupal as a major part of your business operations in areas that Quickbooks and MYOB are lacking. The Drupal node system is used so that almost any other Drupal module can also be added to expand the power of the system. Existing Drupal modules are employed wherever possible, using Views, Gmap, Date, and Calendar modules in particular. The Stratos ERP module can act as the core of a small business, handling all aspects of it except tax reporting and employee payroll. Its features include franchises, stores, quoting/estimates, invoices, purchase orders, payment receipt, stock tracking over multiple stores with the option of tracking by serial number, job tracking, automated item/pricing import from CSV/XLS files via the Web or email, PDF generation of invoices for email, Ubercart item synchronization, POS instant login via RFID tag, and more.