Ruby

A federated, open source microblogging social network

A customer engagement platform for live chat and multi-channel support

A document signing platform with templates, workflows, and audit trails

A self-hosted mail delivery platform for sending and managing email at scale

An open source project management platform with agile and planning tools

A self-hosted travel tracker that visualizes trips on interactive maps

A helpdesk and ticketing system with multi-channel support and APIs

A self-hosted music streaming server for personal music libraries

An RSS reader with tagging, search, and API access

A secure, self-hosted tool for sharing passwords via expiring links