Proof Checker
https://proof-checker.orgThis site based on the Open Logic Project proof checker.. Modifications by students and faculty at Cal. State University, Monterey Bay. See Credits. for details ...
Fitch Proof Constructor - GitHub Pages
https://mrieppel.github.io/fitchjsSome (importable) sample proofs in the "plain" notation are here. Note that proofs can also be exported in "pretty print" notation (with unicode logic symbols) or LaTeX. See this pdf for an example of how Fitch proofs typeset in LaTeX look. To typeset these proofs you will need Johann Klüwer's fitch.sty.