Active Record Bit Fields
Active Record DB Adapters
Active Record Default Values
Active Record Enumerations
Active Record Index Assistants
Active Record Named Scopes
Active Record Nesting
Active Record Sharding
Active Record Soft Delete
Active Record Sortables
Active Record User Stamping
Active Record Value Cleanup
Active Record Versioning
Pagination
Rails Comments
Rails DB Bootstrapping
Rails Ratings
Rails Search
Rails Tagging
Background Jobs
Daemonizing
Daemon Management
Scheduling
Business Logic Frameworks
Form Objects
Service Objects
View Objects
Code Metrics
Asynchronous E-Mail
CRM Apps
E-Mail Delivery
E-Mail Preview
E-Mail Processing
Exchange Clients
Forum Systems
Inline CSS for E-Mail
IRC Bots
Blog Engines
Content Management
Static Website Generation
Wiki Apps
CSS Tools
Font-Face Servers
Web UI frameworks
Amazon DynamoDB
CouchDB Clients
CSV Parsers
Data Migration
MongoDB Clients
Object-relational mapping
Redis Clients
SQL Database Adapters
Benchmarking
Command Line Option Parsers
Command Line Progress Bars
Concurrent Processing
Configuration Management
Deprecation Tools
Gem and Library Inspection
Gem Creation
git Tools
Gnome libraries
GUI Frameworks
irb Alternatives
irb Tools
Presentation Software
Project Management
Rails Version Management
Ruby Core Extensions
Ruby Version Management
Scripting Frameworks
Terminal Coloring
Text Editors in Ruby
Documentation Generators
Gem Doc Viewers
PDF Generation
PDF Processing
Reports & Spreadsheets
Online Shops
Payments
Subscription Management
Game libraries
Music & MIDI
Graphing
Image Processing
QR Codes
Visualizing Data
Breadcrumb Builders
Form Builders
Markup processors
Microformats
Rails Menu Builders
Rails Wizards
Syntax Highlighting
Table Builders
Template Engines
Other Clients
JavaScript Runtimes
JavaScript Testing
JavaScript Tools
Prototype Replacements
Rails In-Place Editing
React Tools
App Instrumentation
Exception Notification
Log Analysis
Logging
Maintenance Mode
Server Monitoring
Networking Tools
Bundler Tools
Dependency Management
Gem Hosting
Packaging Systems
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Amazon Web Services
Asset Distribution
Asset Management
Backups
Continuous Integration
Deployment Automation
Google Cloud
Microsoft Azure
System Provisioning
Web Servers
Rails Activity Feeds
Rails Admin Interfaces
Rails App Templates
Rails Class Diagrams
Rails Extensions
Rails File Uploads
Rails Permalinks & Slugs
Rails Presenters
Rails Subdomains
Recommendation Engines
Reputation Engines
State Machines
User Messaging Systems
Encryption
JSON Web Tokens (JWTs)
LDAP
Rails Authentication
Rails Authorization
Rails Captcha
Security Tools
Spam Detection
A/B Testing
Acceptance Test Frameworks
Browser testing
Continuous Testing
Cucumber Steps
Cucumber Tools
Distributed Testing
Mocking
Mocking Web Requests
Rails Fixture Replacement
Random Data Generation
Test Frameworks
Testing Rails Engines
Test::Unit Extensions
Time Warping
Calendars
Geocoding & Maps
I18n
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Recurring Events
API Builders
Atom & RSS Feed Parsing
HTML parsing
HTTP clients
HTTP Pub/Sub
JSON Parsers
Mock API Servers
Multitenancy
Rails Controller Abstractions
SOAP Clients
Social Network Builders
URL Rewriting
User Agent Detection
Web Analytics
Web App Frameworks
Web Content Scrapers
XML Mapping