GTD-Manager is a software project planning tool. You can add all phases and activities for your project, including milestones, then see it all in a Gantt chart. What sets it apart from other planning programs is the milestone drift diagram. After creating several full plans, you can see by how many days each milestones drifted into the past. Diagrams can be exported to several formats using the VectorGraphics library. So far, only German versions of the software and Web site are available (English versions are in development).
Oligopoly is a Monopoly-like game as a Java applet, directly playable from the Internet. It's written in Java and the object design is very true to the game. It should be easy to modify. It comes with nice graphics and is quite fun, although it lacks many features of the original game. It is currently only in German.
p300 is a P2P application that allows you to share directories with other computers on a LAN or VPN. Other hosts running p300 are automatically discovered using IP Multicast. Bandwidth limiting is supported. You can configure which hosts may access your shared directories. You can use an integrated browser and download manager to download files from other p300 programs on your network, or use your Web browser. You can also use WebDAV to mount the directories from other computers. A search function and an integrated chat (instant messenger) are available.