A website that simulates various finite state machines: Deterministic Finite Automata (DFA), Nondeterministic Finite Automata (NFA), Pushdown Automata (PDA).
A GUI is provided to create, save/load (browser local storage), export/import (plaintext format), and debug finite state machines.
A large set of test strings can be designated to be accepted or rejected and then all tested at once.
Or, a specific string can be step-debugged to see exactly how the finite state machine would handle it.
You can embed a machine description in a URL hash and the page will load it for you. This allows you to provide a link that will load a specific machine. For example:
http://[site-domain]/#[paste machine description here]
A real-world example: Click to load an example machine
MIT Licensed, see License.txt