I spent my ninth birthday at a funeral home because my grandfather died two days earlier.

I use Strawberry for mine.

Are you referring to a drawing tablet? If so, then a good number of ones from the better known brands are supported by the kernel by default. Your safest bet though is Wacom. Wacom is definitely the best supported brand, but it tends to be more expensive than other brands (such as XP-pen and Huion). Non-Wacom branded tablets may require a little bit more initial configuration, like adding a udev rule (I had to do that for my Huion Inspiroy Ink).

It’s not open source, but Tumblr is a decent option if you want something fairly easy to setup. Additionally, it can look very professional with a good theme..

As others have already mentioned, Pixelfed is probably your best option for a FOSS solution to your problem.