This is an alternative implementation of the observer pattern. As you may know, Ruby (and Rails/ActiveRecord) already have an implementation of it. This implementation is a variation of the pattern, so it is not supposed to supersede the existing implementations, but "complete" them for the specific use-cases addressed.

Detailed reports for Active Record Associations

AssociationScope lets Active Record relations expose associations as chainable scopes.

Associate any model to any model.

RESTful wrapper gem for Pigro's APIs

Textile parser for Ruby with auto_link support.

Assume is an assert library with a better name

AbstractSyntaxTree to Dot file.

Pathfinding library using the a* algorithm

Easily convert strings into tokens. In the future you will be able to convert these into a tree as well, but this is far from finished.

AstBuilder is an AST tool that makes it easier to build (and eventually manipulate) nodes

Ruby client library for the Asterisk REST Interface (ARI)

Ruby Gem for connecting to an Asterisk server via the AMI (Asterisk Manager Interface) protocol.

ASTree is like tree command for RubyVM::AbstractSyntaxTree

Your DIY asset distribution web service.

A comprehensive Ruby SDK for the Astrology API (api.astrology-api.io), providing access to planetary positions, charts, horoscopes, analysis, and more.

Astronomical gem to provide various calulations.

Astrology chart calculation in pure Ruby: apparent planetary longitudes (VSOP87D, ELP-2000/82B moon, Meeus Pluto), Placidus and whole-sign houses, retrograde flags, aspects, derived points (Part of Fortune, mean Lilith), aspect-pattern detection and element statistics, plus synastry, transits, secondary progressions, composite charts and solar returns. No C extension, no external data files. Implemented from public formulas (Meeus, Astronomical Algorithms 2nd ed.).

Astrolith is a decoupled astrological data calculation engine that generates structured JSON output. It supports multiple chart types including Natal, Solar Return, Progressed, Composite, and Transit charts.

Get the astrological number from date of birth