What software extends quicktime to support codecs as an alternative to Perian? Now that Perian is closing its doors (and thus ending support), I'd like to know if there are any alternatives to Perian - specifically alternatives that add Quicktime support for more filetypes (and thus all the benefits with Apples Video editing/burning applications)

Of the alternatives that Perian themselves have suggested, none have Perians integration with Quicktime:

Niceplayer - standalone application that relies on Perian(!)

VLC - standalone application that doesn't integrate with Quicktime

MPlayer - standalone CLI program that doesn't integrate with Quicktime

So, are there any other QuickTime-integrated codec applications out there? Bonus points if like Perian it's one application that bundles many codecs.
If even Perian themselves do not suggest anything that has QuickTime integration — they should know — I assume you are out of luck. I miss Perian, too, but have made the switch to Zongyao Qu’s MPlayerX, which is current, useful and pretty (not the Sourceforge flavor!) …