Solving Procrastination, an application of Flow (PDF), good analysis by Kevin Chiu.
2008 Review of Books, by Aaron Swartz. Another list by Matt Webb.
CloudVPN, a small and secure OpenSSL-based VPN for Linux, with mesh networking.
n2n is a layer-two peer-to-peer virtual private network (VPN) which allows users to exploit features typical of P2P applications at network instead of application level. (Very easy to set up, but has no support for multiple supernodes yet.)
tinc is a Virtual Private Network (VPN) daemon that uses tunnelling and encryption to create a secure private network between hosts on the Internet.
Rhizomes promotes experimental work located outside current disciplines, work that has no proper location.