Gears Online
This mecha website covers everything from Gundam to Gunbuster to Super Robot Wars.

 MAHQ Mecha Anime HeadQuarters
If you want specs, you'll get specs! A huge archive of mecha from popular anime and manga. See their specs, alternative versions etc.

 4 Chan Imageboard - Mecha Section
Yes,I know, 4Chan is horrible, filthy and you shouldn't be there. But hey, they've got a mecha section with loads and loads of mecha pictures posted everyday by (anonymous) gearheads. Take a look

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