Here is a sortable table with the most up-to-date information on active house swap websites. This includes links to the sites themselves, information on their specialty, price, number of listings, and a link to my review if one is available. This information was current as of July 2018.
The count of listings is verified by me when possible, and for a few sites represents an estimate based on multiple searches I ran where I could not find total numbers displayed. I now also include a column for “listings (claimed)” where I see a large discrepancy between the site’s listing claims and my actual listing counts.
I recommend selecting the specialty of interest as the primary filter to browse through these sites. For instance, if you want to look at only swap sites that focus on your country you can select the Category of “location” and then select your country from the Specialty column. Or if you want to see sites that are best for swapping all around the world, select the Category of “general”.