Is there document generator extension?

My company need documet generator system with custom field and custom workflow.
for example i will use it for Resignation Proccess
employee input resign form (custom field)
-> { fullname, start work date, reason of resign (description) }
-> submit
->HR verify with complete of end work date and verified
-> employee download verified resign request, print it and sign it
-> upload signed resignation document
-> HR approve the resignation.

and also what extensions i must have?

thanks