An e-mail client, a search engine and a personal webmail server, an easy way to encrypt your e-mail, software you run yourself, on your own computer. Written in Python (and other languages). Probably, Own-Mailbox will use it in its second incarnation.
WAMP application router/hub that allows to build advanced applications from loosely-coupled components that can talk in real-time with each other. Could be an alternative to OpenHAB. Could be evaluated by my students in a project study.
Multifunctional office suite that enables you to store and co-edit documents, manage projects, email correspondence and customer relations in one place. It comprises three separate servers: Document Server, Community Server and Mail Server.