Dealer, partner, vendor, and reseller portals — used by businesses that distribute or service another company's products — are below, with 0 guides. The "official site" link on each guide points to the parent company's partner system, checked manually.
If you have just been appointed as a dealer or partner, the credentials for the portal usually come from the regional account manager, not from a public sign-up form. Sites that promise instant dealer logins for major brands are almost always scams.