Little Hotelier
7.8#1 in reservations softwareAndroidiOSWebAPI
VisitYou want what its maker publishes above — check its page for the details.
Visual Matrix PMS suits properties looking for a web-based system with multi-property support and tools for booking, housekeeping, and POS integration. Its plans offer options for 2 concurrent users, unlimited concurrent users, or listed integrations and customizations.