Public License.</p>

<h2><a href="http://www.openchange.org/">OpenChange</a></h2>

<p>OpenChange aims to provide a portable Open Source implementation of

  Microsoft Exchange Server and Exchange protocols.  Exchange is a

  groupware server designed to work with Microsoft Outlook, and providing

  features such as a messaging server, shared calendars, contact

  databases, public folders, notes and tasks.</p>

<h2><a href="http://pypy.org/">PyPy</a></h2>

<ul>

<li>a common translation and support framework for producing

implementations of dynamic languages, emphasising a clean

separation between language specification and implementation

aspects.</li>

<li>a compliant, flexible and fast implementation of the Python Language

using the above framework to enable new advanced features without having

to encode low level details into it.</li></ul>

</p>

<h2><a href="http://us1.samba.org/samba/">Samba</a></h2>