In case you need a TYPO3 CMS version 9 LTS compatible version of EXT: formhandler, please contact us at hello@phorax.com.
Build rock solid, state of the art forms in TYPO3 the painless way.
Full documentation: http://www.typo3-formhandler.com
The full file history with author names can be found at https://github.com/PHORAX/formhandler