ein einfach zu installierender weave-server mit sqlite
apples caldav calendar server in python
Tartarus provides a nice wrapper around basic Unix tools such as tar, find and curl (well, that's not that basic) to provide a seamless backup solution, aimed at automatic gathering and backup. It has the ability to do full as well as incremental backups
software um einen eigenen openid server einzurichten
Prairie is a lightweight OpenID based Internet identity server.