NoMachine NX, FreeNX, NeatX: Which should I use?

TL;DR: Don't use any of those, use X2Go.

I've used various different VNC servers and clients before, but I've never found them to be very useful. Most of the time the connection is too slow to get anything done. Recently, I found out about NoMachine NX, which has a bunch of really cool technology to make it actually reasonable to use your desktop machine over the internet. And, it runs over SSH, so you don't need to worry about opening up additional ports or encrypting everything.

My own use case was not terribly demanding; I want to access the computer on my desk (running Debian) from my laptop on the couch (running OS X), but I figured if NX works over the internet, it'll work even better over my local wireless network, right?

Unfortunately, NoMachine NX isn't free software. (Although some parts of it are.) Over the years several groups have tried to create an alternative server implementations, striving for compatibility with the NoMachine client software.

I first tried FreeNX, using Ubuntu packages on Debian. (I suppose that should have been a red flag: never use software compiled for Ubuntu on Debian, or vice versa. It's just asking for trouble.) It almost worked. I could connect, but then it would immediately crash. I spent hours trying anything I could to fix it, to no avail.

I tried using NoMachine NX Free, the free-of-charge version of NoMachine NX. It installed everything in weird locations on my machine and that made me angry. Also, I couldn't get it working.

I then tried going back to FreeNX, recompiling all the Ubuntu packages from source on a Debian box to rule out version incompatibilities (which was surprisingly difficult). It wasn't until I was half way through this that I discovered X2Go. The X2Go team maintains a lot of the packages used by FreeNX. Many of the underlying libraries are shared by the two products.

X2Go accomplishes everything that NoMachine NX does, except that it doesn't try for compatibility with the NoMachine NX Client; there is a separate X2Go client, with Windows, Linux and OS X support. That's a good thing, as it allows the X2Go project to control both the client and the server. And, it's packaged for Debian. I installed it and it just worked. Very simple.

So, long story short: use X2Go. Stay away from NoMachine NX, FreeNX, NeatX; they aren't worth your time.