Maemo was Nokia's internet tablet OS.
Here lists archive of their firmwares. For Ovi apps, see Ovi Store
http://tablets-dev.nokia.com/ was the host of the proprietary firmware which required checking of serial numbers. http://skeiron.org/ had an unlocked mirror but it is now gone too. Fortunately, Wayback Macine has an archive at https://web.archive.org/web/20131117073522/http://skeiron.org/tablets-dev/ .
Links may point to Wayback Machine pages but the pages may not be rewritten correctly. Just prefix
https://web.archive.org/web/*/ if you get out of Wayback by accident.
- RX51 firmware (eMMC and rootfs)
- downloads.maemo.nokia.com, repository.maemo.org (core binaries) (mirrors.muarf.org apt mirror)
- ArchiveBot 4feh4wqqqkq0f3t2p4wv3bzff