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I think Coppermine 1.4 (beta) has an XOOPS bridge built in, and coppermine is one of the best photo gallery modules I know of. As for the subscriptions request you can use the donations module (see dev.xoops.org for download) for basic subscription management. MC Subscriptions is a new one as well, but I haven't heard any reports of having gotten it working properly yet. Other than that you can get a professional program like aMember which has an XOOPS plugin, but will cost you about $140USD from memory.