The AjaxSync framework is a HTTP based bus system, containing COMET real-time notification, JavaScript web browser integration, a connector library, EMail/MTA like message buffering and ESB like routing mechanisms. Have a look at www.ajaxsync.org.
PyVpn is a software for management VPN connections for GNU/Linux written in Python using pySqlite and pyGtk. With DB support and Wi-Fi support too. It is based on the "iwconfig" utilities and the "ppp" package.