What are open-source projects in the field of web or networks?

Question

Computer networks

Greetings.
In the arsenal there are the following PLs: C, Java, PHP, JavaScript, there has long been a desire to participate in some open source project.
I would like to ask, maybe someone knows some interesting (or not so) open-source projects on the topic of web applications (or web frameworks), or projects for network technologies (such as firewalls, etc.)?
The fact is that there are quite a lot of projects, so I want to ask who and where participated or just knows about some project.

Answer 1

look for yourself among sf.net, etc.