MessagePack is a binary-based efficient object serialization library. It enables to exchange structured objects between many languages like JSON. But unlike JSON, it is very fast and small.

RGeo is a geospatial data library for Ruby. It provides an implementation of the Open Geospatial Consortium's Simple Features Specification, used by most standard spatial/geographic data storage systems such as PostGIS. A number of add-on modules are also available to help with writing location-based applications using Ruby-based frameworks such as Ruby On Rails.

Proj4 extension for rgeo.

Native extension gem for secp256k1 ECDSA and Schnorr signatures. Wraps libsecp256k1 natively without any need for FFI.

Provides a C-optimized method for underscoring a string

lmdb is a Ruby binding to OpenLDAP Lightning MDB.

Zero allocation backtraces using MRI's profile frames API