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• Duolingo
  Another crowdsourcing startup by Luis von Ahn http://en.wikipedia.org/wiki/Luis_von_Ahn . Learn languages by translating texts - thus improving translation computer algorithms.
• Semantic Versioning
  "simple set of rules and requirements that dictate how version numbers are assigned and incremented" ""For this system to work, you first need to declare a public API. This may consist of documentation or be enforced by the code itself. Regardless, it is important that this API be clear and precise. Once you identify your public API, you communicate changes to it with specific increments to your version number. Consider a version format of X.Y.Z (Major.Minor.Patch). Bug fixes not affecting the API increment the patch version, backwards compatible API additions/changes increment the minor version, and backwards incompatible API changes increment the major version.
• Tutorial Introduction Digital Certificates PKI Guide Encryption Signing Signature
  Old text by Verisign, intro on Digital certificates. Companion text: intro to PKI at http://www.verisign.com.au/repository/tutorial/cryptography/intro1.shtml
• Tutorial: How to align center on the screen when using position absolute with CSS - Hungred Dot Com
  CSS snippet to both horizontally and vertically align a div on the screen.
• jamesgolick/rollout - GitHub
  Ruby gem that lets you roll out features gradually over groups of users so you can first test new features on a small subgroup of users first (possibly identified als early adopters?).
• TestFirst.org - The Home of Test-First Teaching
  "Test-First Teaching provides a fundamental shift in the way people learn software development. Initially, it helps the student focus on learning very basic syntax, able to independently confirm when they have successfully completed an exercise. That immediate feedback is valuable for cementing knowledge. Test-first teaching also teaches an understanding of all of the arcane error messages in a low stress situation. The first thing you see, before you have written a line of code, is an error. Then you discover what you need to do to fix that error. Test-first teaching helps people intuitively understand that mistakes are a natural part of the software development process."
• HTML5 Please - Use the new and shiny responsibly
  HTML5 fact sheet (availability on different browsers) and implementation advice
• Plain Text Offenders
  "A website storing a password in plain text means that your password is there, waiting for someone to come and take it. It doesn’t even matter if you’ve created the strongest possible password. It’s just there. Whether it’s someone hacking into their servers, using a simple flaw in their site or even stealing their backups, over 30% of sites store plain text passwords. We’re tired of websites abusing our trust and storing our passwords in plain text, exposing us to danger. Here we put websites we believe to be practicing this to shame."
• CV Dazzle: Open-Source Camouflage From Computer Vision by Adam Harvey
  "CV Dazzle™ is camouflage from computer vision (CV). It is a form of expressive interference that combines makeup and hair styling (or other modifications) with face-detection thwarting designs. The name is derived from a type of camouflage used during WWI, called Dazzle, which was used to break apart the gestalt-image of warships, making it hard to discern their directionality, size, and orientation. Likewise, the goal of CV Dazzle is to break apart the gestalt of a face, or object, and make it undetectable to computer vision algorithms, in particular face detection. Because face detection is the first step in automated facial recognition, CV Dazzle can be used in any environment where automated face recognition systems are in use, such as Google's Picasa, Flickr, or Facebook"
• Pivotal Tracker - Free Lightweight Agile Project Management & Team Collaboration, from Pivotal Labs
  Pivotaltracker seems to be the favourite tool of startups. However it is not much more than a user story management tool helping you to communicate with the customer/stakeholder and prioritizing your stories. Lacks real project management tools such us time, progress, dependency tracking etc... "Bring everyone, even distributed teams into the same virtual room. Enable a more efficient way to agree on priorities and stay aligned with the entire team. Stay on target with Tracker's continuous, automatic prediction of milestone completion dates, based on your team's performance. Get the right product to the market sooner, based on continuous feedback and prioritization. Respond to changing needs and new requirements easily."