Self-hosted, federated social network server implementing ActivityPub for publishing posts, media, and following users across servers.
Semantic Logger is a high-performance, asynchronous structured logging framework for Ruby and Rails.
Self-hostable private blogging
Storytime is a Rails 4+ CMS and blogging engine, with a core focus on content. It is built and maintained by @cultivatelabs
Fluentd: Unified Logging Layer (project under CNCF)