Top 3 custom-type Open-Source Projects

hypersistence-utils

13 2,282 8.5 Java

The Hypersistence Utils library (previously known as Hibernate Types) gives you Spring and Hibernate utilities that can help you get the most out of your data access layer.
Harbol

1 26 6.2 C

Harbol is a collection of data structure and miscellaneous libraries, similar in nature to C++'s Boost, STL, and GNOME's GLib but for C99+ (by assyrianic)
InfluxDB

www.influxdata.com featured

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
just-types

1 12 3.9 TypeScript

A collection of handy Typescript types.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).