Javascript Performance (Steve Souders) — JavaScript is typically the #1 place to look for making a website faster. Numbers and examples to show this, plus an interesting look at execution order of asynchronously loaded pages: Preserving execution order of async scripts makes the page slower. If the first async script takes a long time to download, all the other async scripts are blocked from executing, even if they download sooner.
Retroshare (Sourceforge) — GPL and LGPLed cross-platform, private and secure decentralised communication platform. It lets you to securely chat and share files with your friends and family, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication. RetroShare provides filesharing, chat, messages, forums and channels. I haven’t tried it, but it’s an interesting premise.
