Bitlash is a great scripting engine, parser and telnet/shell library for Arduino. It lacked support for ESP and has not been maintained for five years.
I've forked and revived it for ESP, Win32 and Unix under the name Hobbitlash.
You can find it here: https://gitlab.com/peter.balogh2/hobbitlash
Any feedback is welcome. I plan on adding more features and further developing it.
Cheers,
Peter