Snowflake lets you interactively create recursive-descent parsers. Website: https://www.mackenziehigh.com/snowflake/ Very Quick Demo: https://tinyurl.com/ph7nv29 Grammar Cheat Sheet: https://tinyurl.com/lhjnj2d Ready to Run JAR of GUI: https://tinyurl.com/pcjp3ty JAR of Library Only: https://tinyurl.com/o3s6h9r