Sources:

• https://awesome-go.com/
• https://golanglibs.com/

Basics

Router/Framework:

• https://github.com/labstack/echo
• https://github.com/gin-gonic/gin (Sinatra-like)
• https://github.com/astaxie/beego (Rails-like)
• https://github.com/gorilla/mux
• https://github.com/julienschmidt/httprouter
• https://github.com/bmizerany/pat
• Docs: https://www.nicolasmerouze.com/guide-routers-golang/
• Docs: https://husobee.github.io/golang/url-router/2015/06/15/why-do-all-golang-url-routers-suck.html

ORM:

• https://github.com/jinzhu/gorm (relationships with Related keyword, callbacks, auto-migrations)
• https://github.com/go-gorp/gorp (relationships but requires join by hand, callbacks, auto-migrations)
• https://github.com/go-xorm/xorm (relationships but requires join by hand, migrations, map[string]string, callbacks)
• https://github.com/astaxie/beego/tree/master/orm
• https://github.com/gobuffalo/pop (complete toolkit, with yaml configuration, true migrations, etc)
• https://github.com/coocood/qbs (very fast, automatic joins)
• http://upper.io/ (no joins)
• Blogpost about it: http://jmoiron.net/blog/golang-orms/
• Reddit: https://www.reddit.com/r/golang/comments/3ajqa6/golang_which_orm_is_better/

Not-ORM:

• https://github.com/jmoiron/sqlx (query builder)
• https://github.com/gocraft/dbr (query builder)
• https://github.com/Masterminds/squirrel (query builder)
• https://github.com/elgris/sqrl (query builder)

Migrations

• https://github.com/mattes/migrate
• https://bitbucket.org/liamstask/goose
• https://github.com/markbates/pop/tree/master/fizz

Queue:

• https://stackoverflow.com/a/45990039 (same process - with goroutines)
• https://github.com/gocraft/work
• https://github.com/RichardKnop/machinery
• https://github.com/benmanns/goworker (resque compatible)
• https://github.com/jrallison/go-workers (Sidekiq compatible)
• https://gist.github.com/harlow/dbcd639cf8d396a2ab73 (how to)
• https://github.com/serdmanczyk/Bifrost
• https://github.com/iamduo/workq (alpha)
• https://github.com/ajvb/kala (not production-ready)
• https://golanglibs.com/category/job-queue?sort=top (list of libraries)

Goroutine Pool

• https://github.com/ivpusic/grpool
• https://github.com/Jeffail/tunny
• https://github.com/go-playground/pool

Web Layer

Oauth Server:

• https://github.com/nasa9084/oauth-example/blob/master/provider/main.go (single file example)
• https://github.com/RangelReale/osin
• https://github.com/go-oauth2/oauth2
• https://github.com/RichardKnop/go-oauth2-server
• https://github.com/ory/fosite
• https://github.com/coreos/dex (authentication service)
• https://github.com/earaujoassis/space (authentication service)
• https://github.com/hkolasani/goauth (simpler)
• https://github.com/jmcvetta/o2pro (deprecated)

Oauth Client:

• https://github.com/shferreira/minimal_go_website/blob/echo-oauth2/app.go (using the standard library)
• https://github.com/dghubble/gologin (Light)
• https://github.com/markbates/goth (Lots of providers)
• https://github.com/volatiletech/authboss/tree/master/oauth2 (too heavy apparently)
• https://github.com/Medium/medium-sdk-go
• https://github.com/huandu/facebook
• https://github.com/go-macaron/oauth2 (middleare)

Websockets:

• https://github.com/gobwas/ws/
  • https://medium.freecodecamp.org/million-websockets-and-go-cc58418460bb (article)
• https://github.com/gorilla/websocket
  • http://arlimus.github.io/articles/gin.and.gorilla/ (example)
• Examples:
  • https://echo.labstack.com/cookbook/websocket#using-net-websocket (example)
  • https://github.com/golang-samples/websocket/blob/master/websocket-chat/src/chat/server.go (example)
  • https://github.com/knowthen/rtsupportserver (example)
  • https://github.com/scotch-io/go-realtime-chat (example)
  • https://github.com/SimonWaldherr/GoRealtimeWeb (example)
  • https://jacobmartins.com/2016/03/07/practical-golang-using-websockets/ (article)
• https://github.com/centrifugal/centrifugo (standalone)

Server-side Events

• https://github.com/appleboy/gorush/tree/master/vendor/github.com/gin-contrib/sse

Amazon S3 Presign:

• http://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/s3-example-presigned-urls.html
• https://blog.golang.org/go-image-package (resizing)
• https://github.com/fawick/speedtest-resize/commit/27b41a8d2cd4de868fbf522c20921762c0e478c1 (resize example)

Form deserializer:

• https://github.com/go-playground/form (FormEncoding to Struct)
• https://github.com/monoculum/formam (slower)

Struct Validator:

• https://github.com/go-playground/validator (with echo: https://echo.labstack.com/guide/request#validate-data)
• https://github.com/asaskevich/govalidator
• https://github.com/monoculum/valider

CSRF:

• https://github.com/josephspurrier/csrfbanana
• https://github.com/justinas/nosurf

GraphQL:

• https://github.com/vektah/gqlgen
• https://github.com/graphql-go/graphql

Swagger:

• https://github.com/go-swagger/go-swagger

JWT

• Don' use JWT: https://news.ycombinator.com/item?id=13867089
  • Use Fernet instead: https://news.ycombinator.com/item?id=13869207
  • https://github.com/fernet/fernet-go / https://github.com/fernet/fernet-go/blob/master/example_test.go
• https://github.com/dgrijalva/jwt-go

HTML Sanitizers

• https://github.com/microcosm-cc/bluemonday

Backend Tools

Distributed Messaging:

• https://github.com/nsqio/nsq

Microservices

• https://github.com/nytimes/gizmo

Scheduler / Cron:

• https://github.com/jasonlvhit/gocron
• https://github.com/welcome-to-shire/gron
• https://github.com/robfig/cron
• https://github.com/ajvb/kala (not production-ready)

Fulltext Search

• https://github.com/blevesearch/bleve
• https://github.com/go-ego/riot
• https://github.com/huichen/wukong

App statistics middleware

• https://github.com/thoas/stats

APIs etc

Recaptcha:

• https://github.com/steambap/captcha

SMTP:

• https://github.com/nilslice/email/blob/master/email.go (Sender)
• https://github.com/flashmob/go-guerrilla/blob/master/server.go (Receiver)

Sendgrid etc:

• https://github.com/sendgrid/sendgrid-go
  • Webhook: https://sendgrid.com/docs/API_Reference/Webhooks/event.html
• https://github.com/mailgun/mailgun-go
• https://github.com/keighl/mandrill/blob/master/mandrill.go
• https://github.com/mailjet/mailjet-apiv3-go

Mobile App Notifications:

• https://github.com/smancke/guble
• https://github.com/appleboy/gorush (standalone)

Error Logging APIs:

• https://github.com/getsentry/raven-go
• https://github.com/bugsnag/bugsnag-go
• https://github.com/yvasiyarov/newrelic_platform_go

Webapp Monitoring:

• https://github.com/sourcegraph/checkup

Slack Bots:

• https://github.com/sbstjn/hanu

Google Authenticator

• https://github.com/dgryski/dgoogauth (Example: https://github.com/yoshiotu/2fa)

Apple Notification Service

• https://github.com/sideshow/apns2
• https://github.com/blackbeans/apns
• https://github.com/edganiukov/apns (uses stdlib for keepalive)

File Formats, etc

Inline CSS for e-mails:

• https://github.com/aymerick/douceur
• https://github.com/vanng822/go-premailer

XLSX Generator:

• https://github.com/tealeg/xlsx
• https://github.com/360EntSecGroup-Skylar/excelize

PDF:

• https://github.com/jung-kurt/gofpdf#gofpdf

Markdown:

• https://github.com/golang-commonmark/markdown
• https://github.com/russross/blackfriday
• https://github.com/madari/goskirt
• https://github.com/madari/goskirt
• http://mates.vs.uni-due.de
• https://github.com/buu700/upskirt.go

Bar Codes:

• https://github.com/boombuler/barcode
• https://github.com/skip2/go-qrcode
• https://github.com/rsc/qr

Image Processing

• https://github.com/esimov/caire (Content-aware resizing)
• https://github.com/nfnt/resize
• https://github.com/anthonynsimon/bild
• https://github.com/h2non/bimg

Charts

• https://github.com/wcharczuk/go-chart

Important Utilities

Debugging

• https://github.com/y0ssar1an/q

Experimental

Expression Parser

• https://github.com/Knetic/govaluate
• https://github.com/elgs/jsonql/blob/master/exparser.go
• https://github.com/mattn/anko (complete language)

Applications Written in Golang

Web Applications

• https://github.com/markbates/buffla (url shortener)
• https://github.com/appleboy/gorush (app notifications service)
• https://github.com/rocajuan/go-img-upload/ (very simple image uploader/resizer service)
• https://github.com/willnorris/imageproxy (complex image uploader/resizer service)