Top 20 NuGet automaton Packages

.NET port of dk.brics.automaton - Project Fare is an effort to bring a DFA/NFA (finite-state automata) implementation from Java to .NET. There are quite a few implementations available in other languages today. This project aims to fill the gap in .NET.
Morfologik Finite State Automata Traversal. Morfologik is a project aiming at generating Polish morphosyntactic dictionaries (hence the name) used for part-of-speech tagging and part-of-speech synthesis.
A Finite State Machine implementation
Automata that can be used to build a regexp