Updating listings online

[Xavier Xthrax]

I am looking for an online service that will post and update my Real estate listing online to multiple websites, free or not such as zillow, Craigslist, realator.com, landwatch, etc all in one motion. I am sure a google search would reveal a few solutions but I am posting because I want personal recommendations by people in the field. It worth noting that I mostly deal in land so not all of my listings will have an address but most will.

I am just tired of having to adjust login everywere when I need to adjust a price.

Thank you for your time.