Nope. As far as I understand you can't even externally install on an iPAD, and Android has its own executable format, APK.

As neat as it would be, GOG doesn't deal in mobile releases as both platforms have 'curated' stores.

While android might be a little possible (granted, you'd have to allow sideloading and have a device that lets such things happen) it's not here, and GoG doesn't give you any Android versions. Closest you'll ever get here are DosBox run games, which can be run using DosBox Turbo. Now there are mobile versions of both Avadon 1 and Escape from the pit, but you'll have to buy them elsewhere.

Apple will never be in another store. They're just that closed in.

Ok, thx guys. I don't know why I was expecting that ipad and android would be treated just as another platform. Same as the diference between mac os and win :-(

Well, some of the games in Humble Store do come with both PC and Android versions. Same goes for some of their bundles like the ongoing Humble PC & Android Bundle 13. Some of the groupees bundles have also had both PC and Android versions if I recall correctly. Avadon and Avernum:EftP have been part of humble bundles and at least Avadon has had Android version bundled with it. Not sure about A:EftP. I only have the PC version but haven't bought too many PC&Android or Mobile bundles. There is also no guarantee that they ever show up again in future bundle's and Humble Store itself does not offer them either.

As far as I can see, the only place you can currently buy Android or IPad versions of Spiderweb games is either Google Play or Apple's iTunes Store.