Collaborative editing in any app.
rbenv lets you easily switch between multiple versions of Ruby. It’s simple, unobtrusive, and follows the UNIX tradition of single-purpose tools that do one thing well.
Mirage is an exokernel for constructing secure, high-performance network applications across a variety of cloud computing and mobile platforms. Code can be developed on a normal OS such as Linux or MacOS X, and then compiled into a fully-standalone, specialised microkernel that runs under the Xen hypervisor.
Chosen is a JavaScript plugin that makes long, unwieldy select boxes much more user-friendly.
Pry is a powerful alternative to the standard IRB shell for Ruby.
A framework-agnostic styled alert system for javascript.
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Read up on our use of AMQP, Solr, Chronos (our job scheduling system), or Goliath (our evented Ruby API framework). (via PostRank in Numbers: 2010 | PostRank Blog)
Lettering.js, a jQuery plugin for radical Web Typography
The HEAD section is the worst place to load scripts. It’s painfully slow. The more and the bigger the worse it gets. Move the scrips to the bottom of the page and you cannot use HTML5 and CSS3 safely. Enter Head JS. The single best solution to this universal problem.