Libraries that support Co via thunk or promise style return values:

• co-child-process - spawn a child process with stdin support
• prompt-promise - Sane command prompt, confirm, multiline, password as promises
• co-prompt - terminal user input utilities
• co-walk - walk a file tree and return a list of files
• check-sum - assert multiple checksums on a stream in parallel
• cogent - simpler HTTP requests using co
• hash-stream - yield the hash of a stream or file
• moko - generator powered models
• octokat.js - a GitHub API client using promises
• pswd - hash and compare passwords with pbkdf2
• raw-body - get and validate the raw body of a readable stream
• unglob - unglob a list of files/globs based on a directory or another list of files
• fly - New generation build system and task automation tool for node using generators.
• eventemitter-co - EventEmitter where you can yield stuff (with co support)
• co-lambda-runner - An interface between generators and AWS Lambda functions

Libraries specifically for use with HTTP servers.

• body - Parse HTTP requests bodies with thunks
• co-body - parse request bodies
• co-busboy - parse multipart bodies
• co-multipart - parse multipart bodies and save to disk
• co-render - template rendering built on consolidate.js
• co-views - higher level template rendering based on co-render
• koa - Expressive middleware for node.js using generators
• co-next — Simple wrapper to use generators for request handlers and middleware. General purpose. Useful for Express routes.

• async-co - async flows backed up by generators & co
• co-assert-timeout - Assert a timeout on a thunk or generator function
• co-blackhole - Filter and ignore errors.
• co-control - Kick off async processes but don't pause code execution until you need the result.
• co-defer – setImmediate and stuff with generators
• co-each - parallel foreach
• co-first – Yield the first async value returned for the co generator library
• co-flow – Flexible execution flow addons (all, any, wait) for co
• co-gate – Gate module to guard asynchronous API with a callback
• co-gather - similar with co-parallel, but will gather all the results even error happened
• co-limiter - Limits how many generators can be ran at the same time
• co-parallel - parallel execution with concurrency support
• co-priority-queue - A simple priority queue
• co-process - Concurrent producer/consumer processing
• co-queue - A FIFO queue
• co-read - consume readable streams
• co-retry - Automatically retry generators that fail
• co-jitter-retry - Retry generators, with full-jitter
• co-select – Yield the first async value returned for the co generator library
• co-sleep – setTimeout that works with the co generator framework
• co-spawn – setImmediate for the co generator framework
• co-sqlite3 - A promise version for node-sqlite3
• co-thread - execute N light-weight threads (generator functions) in parallel
• co-wait – setTimeout generator style
• co-write - write to streams, respecting backpressure
• chan - A go style channel implementation for JavaScript that works nicely with co.
• chanel - parallel execution with concurrency and "streaming" support
• comm - Rust-inspired communication primitives for asynchronous message passing.
• coo – Flow control library based on co
• defer - setImmediate, setTimeout, etc. with generators
• co-filter - Parallel filter generator function
• co-reject - Parallel reject generator function
• co-ware - Easily create your own middleware layer using generators
• composedly - Create compositions of middleware and named it
• congestion - Generator-based congestion control
• co-functional - Functional helpers (map, filter, reduce, compose, ...)
• co-compose - Koa and AdonisJs style middleware for your own apps.

Libraries that more-or-less just wrap other libraries.

• mongodb-next - promised and streams2 wrapper around mongodb with a fluent API
• mz - promisify most of node's async methods
• co-foreach - Run generator function as forEach loop callback
• co-aliyun-oss – aliyun oss client for co or koa
• co-aws2 – AWS wrapper for generators
• co-aws-sdk – AWS wrapper for generators
• co-baidu-push – a wrapper of baidu-push for co or koa
• co-baidu-bcs – a wrapper of baidu-bcs for koa or co
• co-cache - Cache result in redis for GeneratorFunction or function that return a Promise.
• co-couchbase - a couchbase wrapper
• co-emitter - emitter mixin/object that allows a middleware pattern using generators.
• co-event - return emitter events in sequence
• co-easymongo – Co-based easymongo
• co-express - express wrapper that enables generators to be used as middle wares
• co-fbgraph – co wrapper for fbgraph package
• co-feedparser – co wrapper for feedparser package
• co-fs-plus - supports fs.walk fs.mkdirp etc for co-fs
• co-github – co wrapper for node github api
• co-jugglingdb – Wrap jugglingdb methods for use with co
• co-level - levelup wrapper
• co-limits - co support for limits.js
• co-mkdirp - A promise version for mkdirp
• co-mongo - Complete mongodb wrapper
• co-mongodb - native mongodb driver wrapper
• co-mongomq – co wrapper for mongomq package
• co-monk - monk mongodb wrapper
• co-mysql – a mysql wrapper for co or koa
• co-nano - CouchDB nano wrapper
• co-node-trello - A wrapper for node-trello
• co-pg - PostgreSQL wrapper
• co-redis - node-redis wrapper
• co-repl – Write non-blocking code in a nice-ish way in a node.js repl
• co-request - request library wrapper
• co-rethinkdb - RethinkDB wrapper
• co-seven – seven module in co harmony yield
• co-slug – create a slug with co and generators
• co-sqlite3 - A promise version for node-sqlite3
• co-ssh - ssh client
• co-temp - co wraper for temp, to create temporary files and directories
• co-urllib – co wraper for urllib
• co-wait - setTimeout wrapper
• co-wd - wd (webdriver) wrapper
• co-yongoose – A mongoose REPL with yield
• gap - Generator friendly version of tap
• kongo - Mongo-collection wrapper.
• mysql-co - mysql wrapper
• promisifier.js - Converts callback-based APIs to ES6 promises with convenient chainable promises.
• remodel – Generator-based query interface for rethinkdb
• repl-co – node repl with yield support
• rethinkdb-co – Harness RethinkDB Callbacks with ECMAScript 6 Generators
• genify – Bringing power of javascript generators into normal javascript environment

• co-cat - Concatenate streams
• co-from-stream - Convert a node stream
• co-map - Map a stream over a function
• co-read – Consume a readable stream generator-style
• co-respond - Respond to HTTP requests
• co-sse - Server-Sent Events stream
• co-sse-events - Stream Server-Sent Events from an emitter
• co-stream - The stream spec
• co-stream-map - Map a stream over a stream

• co-ejs - Embedded JavaScript Templates for koa

• co-slowlog - slowlog for GeneratorFunction or function that return a Promise.

• cassandra-co - ORM for Cassandra's nodejs client