Not included: Handwritten

Lexers:

• Rex/Rexical
• Ragel
• piotrmurach/lex
• Handwritten (e.g. with StringScanner)
• re2c with bindings to Ruby

Parsers requiring lexer:

• Racc
• Yacc/Byacc/Bison/Lemon with bindings to Ruby

PEG:

• Treetop
• Parslet
• kpeg
• citrus
• peg/leg with bindings to Ruby
• Canopy
• Waxeye

Parser combinators:

• D★Parse
• Parsby

All-in-one solutions:

• RLTK

Articles

• [Parser Combinators in Ruby

  hmac.dev](https://hmac.dev/posts/2019-05-19-ruby-parser-combinators.html)

• Introduction to parser combinators – The If Works
• Building a Programming Language in Ruby: The Parser
• Calculator Tutorial Part 1: Basic lexer