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Sourcefinder should be ok as it is run by Skynet the same as Pogs.

Enigma had a poll before the voting issues, so I assume it passed muster then.

I don't know about Xansons as I dont know the requirements. It doesn't seem to be HTTPS but the Sourcecode has been released.

I know POGS was whitelisted before they had https, but maybe we're more strict now. I also don't know the requirements. They're probably buried somewhere in the main forums, but I'm too lazy to dig :-)

This topic will be discussed at this Saturday's Gridcoin hangout. I posted a comment, basically copy/pasting your original comment from pepper's post. I'll give you the proceeds of that comment, if it happens to get upvoted.