Owl parser generator is described as 'Owl is a parser generator which targets the class of visibly pushdown languages'. There are seven alternatives to Owl parser generator for Linux, Windows and Mac. The best alternative is Flex, which is both free and Open Source. Other great apps like Owl parser generator are Bison (Free, Open Source), ANTLR (Free, Open Source), parboiled (Free, Open Source) and textX (Free, Open Source).
ANTLR, ANother Tool for Language Recognition, is a language tool that provides a framework for constructing recognizers, interpreters, compilers, and translators from grammatical descriptions containing actions in a variety of target languages.
textX is a meta-language for building Domain-Specific Languages (DSLs) in Python. It is inspired by Xtext. It will help you build your textual language easily. You can invent your own language or build a support for an existing textual language.
Ragel is a finite-state machine compiler and a parser generator targeting C, C++ and ASM. It can recognize byte sequences and execute code at arbitrary points in the process. POTENTIAL USES Writing robust protocol implementations. Parsing data formats.