The Internet Archive hosts — not playable in your browser (like old arcade games), but downloadable as ISO, GOD, or JTAG/RGH file formats . These are typically:
Why the Internet Archive is Essential for Xbox 360 Preservation
Because the collection is community-driven, it is essential to check file comments and ensure the ROMs/ISOs are "clean" (i.e., not corrupted) by looking for REDUMP verified files.
The consists of thousands of user-uploaded and curated collections containing ISO images, digital dumps, and ROMs of Xbox 360 games, XBLA (Xbox Live Arcade) titles, and system updates.