- HBL channel can be found on dimok's github
- WUP installer GX2 channel can be found with a simple Google search
- I'm not aware of any ftp channel yet but you can always install another DS title with WUP installer then convert it to another HaxChi then set it up to autoboot to a specific elf file
Also you can install as many HaxChi's that you want. As long as you are already in a CFW you use Wii U USB Helper to grab some HaxChi compatible DS games. Install them with WUP installer and then install Haxchi over the top. I'd recommend putting them on USB so if you ever get legit HaxChi and/or CHBC+HaxChi then you won't confuse the two.
Once you have a HaxChi on USB you can have it autoboot any elf you want. Plus it will be in the system menu. You can even change the icon and boot screen and music.
Remember, I'm not talking about legit HaxChi with buying a game from eshop. I'm talking about using Haxchi to create "channels" for whatever want you WHILE YOU ARE RUNNING IN CFW"
There are a few threads on here where people have already created icons and boot music etc. for various HBL elfs for HaxChi. You should look around for some.