Awesome Lists with GitHub stars

Warning
This list is deprecated in favour of the official Alfred Gallery.
Future submissions should be directed there.

Communication

Adium - Adium workflow to chat with people on your list.
MailTo - Quickly compose emails to your contacts and contact groups.
Mailsy - Quickly generate a disposable email.
Slack - Alfred workflow to interact, and perform various functions with the service Slack.
TemporaryEmail - Get a temporary email inbox.
Mouseless Messenger

AWS Console Services - Quickly open up AWS Console Services in your browser or search for entities within them.
Bootstrap Icons - Quickly look up Bootstrap Icons and add the desired one to your clipboard.
caniuse - Caniuse.com workflow to query HTML / CSS support.
caniuse.rs - Rust feature support and version info from caniuse.rs.
CDN - Check which CDNs a package is hosted on.
Colors - Convert color formats & access the OS X color panel.
Dash - Allows you to query Dash for Developer Documentation.
DevDocs - An Alternative to Dash. Allows you query devdocs.io for documentation.
Fakeum - Generate all kinds of test data.
Font Awesome - Quickly look up font awesome icons and add the desired one to your clipboard.
Github - GitHub command bar, similiar to the command bar in Github.
Git Repos - Search and open the Git repos on your system.
JetBrains - Open project with one of JetBrains’ products.
Laravel Forge - alForge, Open and run commands on Laravel Forge.
mdi - Find Material Design Icons .
npms - Search for npm packages with npms.io.
ng - Search through the angular.io documentation.
Package Managers - Package Repo Search.
Packagist - Search for PHP packages with Packagist.
Source Tree - List, search, and open Source Tree repositories.
Tailwind CSS Docs - Search the Tailwind CSS documentation.
VagrantUP - List and control Vagrant environments with Alfred2.
VSCode - An Alfred 4 workflow opening files or folders with Visual Studio Code.

Encode / Decode - Transform your query strings through base64, html, url, and utf-8 encode/decode.
Funnel - Funnel selected text or a file through various filters.
hl - Syntax highlight code in the clipboard.
HTML Entity Lookup - Search for entity characters based on how they look or by name.
Pandoctor - Alfred interface to pandoc, a tool that allows to convert between text formats (Markdown, LaTeX, DOC, DOCX, …).
Unicode Text Search - Search for Unicode Symbols.
VSCodeDiff - Show the diff of the last 2 items in clipboard history using VSCode.

Convert - Offline conversion of units and (crypto)currencies.
DOITools - Tools to resolve, open, shorten DOI numbers and even convert them to bibtex.
Scientific Workflow - Workflows that are useful for scientists: e.g. LaTeX, importing references in bibtex.
Skim remote - Controls the Skim PDF Viewer remotely from Alfred.

Google Calendar View - View your Google Calendar events.
I Sheet You Not - Generate your own workflows from Excel spreadsheets.
iMessage 2FA - Find two-factor authentication codes in your recent iMessage messages.
PDF Tools - Optimize, encrypt and manipulate PDF files.
Things - Interact with Things 3 using Alfred.
Timing - Interact with the Timing app.
Todoist - Add tasks to Todoist.

AppFreeze - Pauses and resumes execution of the frontmost app.
AppScripts - Search and run JXA/AppleScripts for the active application.
Bluetooth Controller - Manage bluetooth status and device connectivity.
Copy Paths to Clipboard - Copy Current File Paths to Clipboard as POSIX, HFS, or File URLs.
Finder New item - Swiftly create new items in Finder with support for templates.
Fkill - Fabulously search and kill processes.
Keyboard Maestro - Execute Keyboard Maestro macros from Alfred.
Keylue - Key Clue, Menu Bar and Keyboard Maestro Hot Key Search
Network Info - Display ip addresses or mac addresses for all network interfaces.
SSH - Autocompletes SSH sessions based on ~/.ssh/known_hosts, ~/.ssh/config and /etc/hosts
SSH iTerm - Query ~/.ssh/config and open ssh host with iTerm badge.
Swift Windows Switcher - Switches between open windows and a browser (Safari/Chrome) tabs.
TemporaryMute - Mutes the volume of their computer for a specified duration of time.
TerminalFinder - Alfred workflow to open current Finder window in Terminal/iTerm and vice versa.

Alfred Workflow (for Dart) - Dart library for writing Alfred workflows. Inspired by Alfred-Workflow for Python.
Alfy - Node.js library to create Alfred workflows with ease.
AwGo - Full-featured library for Go to build lightning-fast workflows in a jiffy.
Fuzzy Search - Add fuzzy search to any Script Filter.
OneUpdater - Minimal Configuration method in adding auto-updating to your workflow.

Here are a list of other collections of alfred collections which are useful.

Ctwise Alfred Workflows - Workflows from the Github user “ctwise”.
Packal - The biggest place to find Workflows.
PacMax – Pacmax was assembled as a way for Alfred lovers to find and share their favorite workflows, snippets, and themes.
Vítor Galvão’s Alfred Workflows - Workflows from the Github user “vitorgalvao”.