DynDRest
... is a simple REST-service for dynamic DNS. It supports multiple implementations of different DNS providers.
Birthday Calendar Service (BCS)
... it creates and synchronizes a birthday calendar from CardDAV address book data. Syncs recurring birthday events to CalDAV calendars.
CloudflareDNS-java
... is a Java client for minimalistic access to the Cloudflare API v4, mainly used for managing DNS settings such as creating, updating and deleting DNS records.
borg-wrapper
... a simple wrapper for BorgBackup with a bundled Munin plugin for monitoring backup status.