NGINX modules in Lua and C

Question

Is it possible to build and deploy modules in C or Lua for NGINX with the free version of NGINX? Or must you have a license for NGINX PRO?

Answer 1

It's certainly possible. Moreover, Lua module is not a part of original nginx but it's still built and distributed in all major linux distros.

http://nginx.org/LICENSE

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:...

Answer 2

It's of course possible and here is the famous example - https://openresty.org

OpenResty bundle is based on free open source nginx version and includes a lot of C and Lua modules.