moneyGuru is a personal finance management application. It allows you to evaluate your financial situation so that you can make informed (and thus better) decisions. Most finance applications have the same goal, but moneyGuru's difference is in the way it achieves it. Rather than having reports which you have to configure (or find out which pre-configured report is the right one), your important financial data (net worth, profit) is constantly up-to-date and "in your face". This allows you to constantly make informed decision rather than doing so periodically.
The ea-Geier is a tool that handles accounting on a cash basis for Austrian companies (Buchhaltung zur Einnahmen-Ausgaben-Rechnung). With modular accounts code and a multi-lingual design, it is easily adjustable for other countries. It allows you to book and administrate your incomes and expenditures, manage assets (depreciation for wear and tear), your purchased goods intended for resale, and travel expenses.
libgeier is a library to send gathered tax declarations data to the German inland revenue offices (using the Elster2/Coala-approach). It is capable of validating, encrypting, digitally signing, and sending the data, which has to be supplied as an XML tree. It can generate transmission protocols for you. A small command line client is included.
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.
SkaDate is professional and fully customizable dating software with professional templates, apps, and forum and ticket support, in addition to free lifetime access to updates and version upgrades. It features close to a hundred features, multiple language support, an affiliate system, and an extensive member control panel.
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.