Youyouaidi offers a UUID class for parsing, validating and encoding UUIDs

Generate UUID(rfc4122) version 3(based on md5) or version 5(based on sha-1).

Adds a :uuid column to ActiveRecord MySQL2 Adapter. Store UUIDs as 16 bytes binary column.

An easy uuid wrapper for ruby applications

Uuid fields for mongoid

This is a library generating unique id in short pattern.

active_record_uuid is a nice gem that add uuid supports to your activerecord models (MySQL). It allows you to store uuid in various formats: binary (16 bytes), base64 (24 bytes), hexdigest (32 bytes), or string (36 bytes), and query back with uuid string.

Provides UUID generation for Mongoid models. It includes a validator for UUIDs.

Support for binary UUIDs in ActiveRecord

UUID "version 6" implementation in Ruby

This is a UUID class intended to help control data locality when inserting into a distributed data system, such as MongoDB or HBase. There is also a Java implementation. This version does not conform to any external standard or spec. Developed at Groupon in Palo Alto by Peter Bakkum and Michael C...

Helps using uuid everywhere in routes instead of id for ActiveRecord models.

The has_uuid gem adds a UUID to your AR models. See the README for details.

UUID Validator for ActiveModel

FFI Wrapper for libuuid with extra helpers for common UUID tasks like getting an array of uuids for quicker distribution

UUID generator/parser in <300 lines. It fully supports UUID versions 1, 3, 4 and 5.

UUIDs that are byte-ordered lamport clocks (timestamp, worker_id). Much simpler than type-1 UUID's crappy, weirdo layout.

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Extract UUIDs/architecture information from a standard dSYM file

Typed UUIDs 2 bytes are reserved in the UUID for the class enum