QuestDB is an open source time-series database for fast ingest and SQL queries

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Style and Grammar Checker for 25+ Languages

Open Location Code is a library to generate short codes, called "plus codes", that can be used as digital addresses where street addresses don't exist.

Create custom vector tiles from OpenStreetMap and other data sources with Postgis and Java.

OpenGL vector map library - running on Android, iOS, Desktop and browser.

a vector-tile map library written in java - running on android, desktop and within the browser

JOSM Plugin allows select areas to label using a range of colors,