My network tool - inadequate expression

There are many fun things on the network, and quite a few of them are useful; some are just for temporary amusement and are quickly forgotten and ignored, while others may continue to be used. Perhaps these things are not so essential that we "can't live without them," but with them, we might find it more convenient and be able to better leverage the utility of the network as a tool, while also adding a bit of fun.

Below is a collection of commonly-used network services that I've tried and believe are worth recommending to everyone. Of course, different people have different needs, and the ones I list are just those that I personally consider important. Similarly, there may be many similar tools available online, and since preferences vary, I can only list the ones I've used and found interesting.