Persevere can handle real-time notification of changes in data with long polling and Comet and Bayeux support. Persevere can also be used as a front end to other databases through pluggable data sources, exposing existing tables, documents or other content through the REST API. Persevere is made available under the modified BSD Licence or the Academic Free Licence 2.1. The code is hosted on Persevere's Google Code project page. Documentation can be found on docs.persvr.org.