Heimdall Application Dashboard is a dashboard for all your web applications. It doesn't need to be limited to applications though, you can add links to anything you like. Some recognized applications can have their APIs accessed if you enter credentials. Recognizes other applications for the purpose of search and autocomplete. Written in PHP, uses SQLite as its datastore.
Modoboa attempts to be a webmail application that does not suck. Clean interface, easy to use. Manage multiple accounts with multiple ACLs and multiple domains. Integrates with LDAP and Postfix. Allows auditing of access and use. Control Amavis if it's used for mail scanning. Written in Python. Open source, repository is on Github.