How to organize a form signature using an EDS and its verification on the server?

Question

Electronic digital signature

Can you suggest what are the best tools to use to organize this process?
It is necessary to sign the form in the browser using the EDS when sending it to the server, and check this signature on the server. On the client side, as I understand it, you can use CryptoPro EDS Browser plug-in or something else is better and is there something free?
Restrictions are about the same as on the public procurement portal.
Server on Linux.
JP Python.

Answer 1

Browser plugin. From free did not meet.