Vines is an XMPP chat server that supports thousands of simultaneous connections, using EventMachine for asynchronous IO. User data is stored in a SQL database, CouchDB, MongoDB, Redis, the file system, or a custom storage implementation that you provide. LDAP authentication can be used so user names and passwords aren't stored in the chat database. SSL encryption is mandatory on all client and server connections. The server includes support for web chat clients, using BOSH (XMPP over HTTP). A sample web application is available in the vines-web gem.