- Mad science
- Command-line apps
- Functional programming
- HTTP
- Debugging / Profiling
- Logging
- Command-line utilities
- Build tools
- Hardware
- Templating
- Web frameworks
- Documentation
- Filesystem
- Control flow
- Streams
- Real-time
- Image
- Text
- Number
- Math
- Date
- URL
- Data validation
- Parsing
- Humanize
- Compression
- Network
- Database
- Testing
- Security
- Benchmarking
- Minifiers
- Authentication
- Authorization
- Job queues
- Node.js management
- Cross-platform integration
- Natural language processing
- Process management
- Automation
- AST
- Static site generators
- Content management systems
- Forum
- Blogging
- Weird
- Serialization
- Miscellaneous