- Pretty Ruby - gem to extend Enumerable/Array in beautiful ways
- Uses refinements instead of monkey-patching
- Great article: https://dzone.com/articles/making-ruby-yours
- Bundler-audit
- Roo - gem to read/write various spreadsheet formats (Excel, OpenOffice, CSV)
- For old Excel XLS files and Google spreadsheet, add roo-xls and roo-google gems
- rb - use Ruby as a command-line tool
- Use Ruby more like Perl -pie
- Property-based testing libraries (haven't tried any of them yet)
- PgSearch - full-text search
- Pry-byebug - allows setting breakpoints
- Rubocop
- style checker (linter) and formatter based
- based on Ruby Style Guide
- Reek
- detects code smells
- bundler-audit
- checks for vulnerable versions of gems