Mailman 2 (from Debian) with LMTP patches.
Painless management of DNS zones.
WebDAV authentication bridge (between webdav-server and auth-server).
VM-ine a.k.a. "diminutive VMs".
CI build orchestration toolkit.
Receive spam feedback loop emails and store them in a database (temporarily) for visualization / aggregation.
Common code for out Python-based (Flask) web applications.
Docker image meant to run "float" easily.
Internal MySQL management API (pwchange).
SSO library and server.