Xcode doesn't have a public plugin API. Every single one of these packages, including Alcatraz itself, is relying on undocumented and unsupported functionality. I would very strongly caution against installing any of it.
If you do have issues with a particular package it is pretty simple to remove any/all of them. The only time I have had issues is when I've tried to run betas of Xvim on unreleased versions of Xcode.
Seriously, if you're interested at all in the packages made available through Alcatraz give it a shot.
If the tools solve useful problems, who cares if they break later? We'll fix them.
I would very strongly caution against Apple continuing to provide such a boneheaded IDE.
The existence of the compatibility UUID does not mean that Apple has blessed plugins. They're just trying to reduce their support load, and reduce their users' crashes at the same time.