Welcome to Gflash!
Gflash is a name that usually refers to the main server that Alex811 manages and owns.
Sometimes it refers to a group of servers, working together with the main one.
There are also Minecraft modpacks under that name, which you can find here.
Gflash also hosts some game servers. You can learn how to connect to them, through this website.
You should be able to find all the info you need on the things hosted here, that are also public, through the navigation menu at the top.
Have a good one! \( ^-^ )/