Stellar is available all over the place, in fact right now BlockChain.com is still in the process of giving away $25 USD worth of Stellar Lumens per validated user, so it might be worth your while to get yourself validated there. If you can get their weird photo-ID thing to work, for me it just keeps taking a photo then claiming the internet hiccuped and taking the photo again, and again, and again, never failing to claim the internet hiccuped.
HORIZON the last released version can be downloaded from inside my
http://LFM.knotwork.com/ site if you can't find it elsewhere.
I have not modified it so you will need to give it some current active nodes, I believe my site says how to do that.
A bunch of other coins some might regard as "obscure" are also available (in source code) there too, such as some of the original family of merged mined coins merged mined alongside bitcoin and devcoin. (IXCoin, I0Coin, GRouPcoin, CoiLedCoin etc).
The thing with HORIZON is that it is a NXT clone, so all trading pairs have to have its native token (HZ) as one side of the pair.
Stellar lets you offer any asset directly against any asset, no need to involve its own token (Stellar Lumens, XLM).
But, Stellar needs a so called "line of trust" for each asset you want to use, and each line of trust "ties up" ten Lumens as long as the line of trust exists.
Still, being able to trade arbitrary pairs directly, only needing to worry about their value relative to each other without reference to the platform's native currency, is kind of nice.
Also its fees might actually work out cheaper, depending on how much an HZ turns out to be worth.
That is the trouble with HORIZON, to use its trading pairs feature we need to somehow arrive at a value of the HZ itself, and right now HZ is yet another token you don't find on the public, website-type "exchanges" since Poloniex de-listed it.
It seems to have been used as if it were about a Canadian penny per HZ, but that is probably only because the vast majority of folks who actually have some still think it is "dead" since Poloniex de-listed it; if those folks come back chances are a lot of HZ will be wanting to get dumped for anything they think they might be able to "cash out" somewhere. Which might put a premium on things like IXC and I0C and maybe even DVC that can still be found on the typical website-type public "exchanges" folks are used to.
-MarkM-