It looks to me like they are posting releases in the "Documents and Files" section of the project. See here:
http://jsapar.tigris.org/servlets/ProjectDocumentList?folderID=11435
Looks like they offer a zip with the JAR and JavaDoc included and another with the source code.
Update 2019: binaries are found in the Maven repository automatically. For code, you can visit their website at GitHub at the following address: