Do such free software exist?

Question

CCTV

The 3CX PBX has the possibility of web video conferencing, a cool thing for communication, however, the server configuration needs of 3CX are quite high, due to the fact that this is the first PBX with powerful functionality, there is a free MYchat web chat, everything is super, however, voice and video transmission available for only two participants, while the conference is current text. My Needs:
1) Voice transmission (preferably also video) At least for 3 participants.
2) Installing server software on your computer (Linux or Windows core2duo 4 GB RAM)
3) All participants connect to the conference through a clean browser (Windows in the main Firefox)
4) link to the website.

Answer 1

For example - https://www.igniterealtime.org/ however, you will have to work with your hands and head.

Answer 2

https://www.loowid.com/
I set it myself - everything works.
I am the author of the translation into Russian, if something is crooked - write.

Answer 3

teamspeak - for voice chat.