CultSwitch
7.4#4 in hotel channel managementFrom €75 a monthAndroidiOSWebAPI
VisitCultSwitch is aimed at independent accommodation providers, including hotels, hostels, holiday homes, apartments, and small hotel groups. It may suit properties that want channel synchronization, PMS updates, or an optional direct-booking engine.
You want what its maker publishes above — check its page for the details.