Direct Booking options - Needs to sync with OTA's

[Chris O.]

I'm using Mobirise v5, so not sure how limited my options are. I'm trying to find if there's a direct booking tool/calendar I can embed on my site, without going to a full blown PMS. The 3 direct booking tools I've found so far are

Availability Calendar - company says they can sync with the big 3 OTA's, but direct booking I'd have to manually update (which is fine at this stage). Anyone have any experience using this? 

PHPJabbers - doesn't work with OTA's

Availcalendar - can't even figure out how to contact anyone there - doesn't seem like something worth relying on.

Anyone else using any direct booking software/calendars on their sites without utilizing a full PMS?