CsvMail is an HTML form mailer and manager. It mails the results of form submissions and also writes the entry to a secure.csv file. It requires minimal HTML form changes - just change the beginning form tag to post to CsvMail. It is very easy to configure, but includes plenty of extra options, including domain security settings and a bounceback required fields option. A fully-functional evaluation version is available.
lunafin is a home banking program that comes in two parts. The first part is a Perl/GTK+ frontend for displaying statement-information on a current account, and the second is a backend that fetches account data from the bank and stores it in a MySQL database. lunafin only works in conjunction with certain German savings banks ("Sparkassen").
gnome-courier is a collection of programs for courier services. It includes programs for managing clients, managing coworkers, managing jobs (receiving, distributing, and editing), printing bills and overdue notices, and managing the payroll. Various statistical modules are available, and since the project is based on a modular concept, it can easily be extended.