The open avatar service

Libravatar is a service which delivers your avatar (profile picture) to other websites. If you create an account with us, your photo could start popping up next to forum posts or blog comments on any site where you left your email address.

The (composite_value).* expansion to columns was new to me. And useful in a recent query I had to write.

@zeeg (haven't used it, but) healthchecks looks charming

Vega is a visualization grammar, a declarative language for creating, saving, and sharing interactive visualization designs. With Vega, you can describe the visual appearance and interactive behavior of a visualization in a JSON format, and generate web-based views using Canvas or SVG.

Toshi is meant to be a full-text search engine similar to Elasticsearch. Toshi strives to be to Elasticsearch what Tantivy is to Lucene.