UVmapper Classic (if it's still out there) is nice. The pro version is decent from what I understand but not free like the classic one.

Then there was some cool wall texture generator from acme brick company. Intended to make patterns for people buying real bricks, but it creates nice .jpgs. I think the website is www.acmebrick.com or some variation. Dunno if the app is still there, but it couldn't hurt to look.

I was going to say Wings too, but I've been beat to that one already...

Oh yeah-- Arbaro! You can find it at arbaro.sourceforge.net. It's a nice Java based tree generator for scenes where the Bryce trees just aren't good enough.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.