CovfefeA parser for nondeterministic context free languages
YaccConstructorPlatform for parser generators and other grammarware research and development. GLL, RNGLR, graph parsing algorithms, and many others are included.
ebnfEBNF parser and generic parser generator for Ruby.
human-parser-generatorA straightforward recursive descent Parser Generator with a focus on "human" code generation and ease of use.
nimlyLexer Generator and Parser Generator as a Library in Nim.
RBNFThis project's lifetime has ended. The successor is https://github.com/thautwarm/frontend-for-free which is WIP. You can check lark-parser project which is a good alt.
language-grammarsSyntax highlighting for ABNF/BNF/EBNF, Yacc, and other language-related languages.
dropincc.javaA small and easy to use parser generator. Specify your grammar in pure java and compile dynamically. Especially suitable for DSL creation in java.