• uuid - Simple, fast generation of RFC4122 UUIDS.
• ObjectId - bson/blob/1.0-branch/lib/bson/objectid.js)) - MongoDBs ObjectId
• human-readable-ids - readable-ids)) - Use JavaScript to generate human-readable ids from a list of nouns and adjectives.
• unique-string - string)) - Generate a unique random string.
• lodash.uniqueid - The lodash method uniqueId exported as a Node.js module.
• get-uid - uid)) - Simple random id generator.
• uid - Generate unique ids of any length.

JavaScript

• ulid - Universally Unique Lexicographically Sortable Identifier.
• uuid - Simple, fast generation of RFC4122 UUIDS.
• cuid2 - Secure, collision-resistant ids optimized for horizontal scaling and performance. Next generation uuids.
• crypto-random-string - random-string)) - Generate a cryptographically strong random string.
• yeast - Yeast is a unique id generator.
• nanoid - A tiny, secure URL-friendly unique string ID generator for JavaScript.
• shortid - Amazingly short non-sequential url-friendly unique id generator.
• uniqid - A Unique Hexatridecimal ID generator.
• puid - Generate a unique ID depending on time, machine and process for use in a distributed environment.
• flake-idgen - idgen)) - Flake ID generator yields k-ordered, conflict-free ids in a distributed environment.
• uniqueid - Generate sequential IDs, with optional prefix or suffix.
• hyperid - Uber-fast unique id generation, for Node.js and the browser.
• uid - Generate unique ids of any length.
• uid-safe - safe)) - URL and cookie safe UIDs.
• uuid-readable - readable)) - Generate Easy to Remember, Readable UUIDs, that are Shakespearean and Grammatically Correct Sentences.
• human-id - id)) - Generates human-readable identifier strings by chaining common (short) words of the English language.
• unique-sequence - sequence)) - Generate short sequential strings.
• breezeid - Easily generate unique, human-first IDs
• ksuid - K-Sortable Globally Unique IDs

Polyglot

• uuidv7 - editor.org/rfc/rfc9562#name-uuid-version-7)) - UUID 128-bit unique identifier that is time-sortable with 1 ms precision.

Python

• muid - Generates IDs whose hashes are, in part, memorable. See [video explanation](https://vimeo.com/397352413)

Go

• xid - Xid is a globally unique id generator thought for the web.
• ksuid - K-Sortable Globally Unique IDs.

Go

• RoboHash - Generate unique images from any text.

Go

• uuinfo - A tool to debug unique identifiers (UUID, ULID, Snowflake, etc).
• OSSP uuid - ISO-C API and CLI for generating UUIDs

Go

• The definitive guide to modulo bias and how to avoid it - Generate unbiased random numbers.
• Efficiently generating a number in range - Discusses performance problems in PRNGs and many algorithms.
• Nano ID collision calculator (by Alexey Komarov)
• Nano ID collision calculator (by Aleksandr Zhuravlёv)
• Understanding modulo bias
• Devina.io collision calculator