This service uses linguistic analysis to detect and interpret emotions, social tendencies, and language style cues found in text.

This is a site you use to test clients – mobile apps, browsers, and many other applications that use HTTP applications and TLS – the Transport Layer Security protocol. We have designed a lot of tests that checks if your browser or client application really checks the identity of the server it’s trying to connect to. It is important that developers understand how TLS works and how site verification works.

Stream allows you to build scalable newsfeed and activity streams in hours instead of weeks. The documentation will get you up and running quickly. At the moment we have official clients for Ruby, JS/Node, Python, PHP and Java. Furthermore there are also example apps and Framework integrations available for Rails, Django and Laravel.

There are a few excellent payment gateways that have come along and made it easier for people in the US to take payments like Stripe, Dwolla, and WePay. What are the options for the non-US merchant, though? What can they use to take payment?

This web app lets you upload a favorite MP3 and will then generate a never-ending and ever changing version of the song. Infinite Jukebox uses the Echo Nest analyzer to break the song into beats. It plays the song beat by beat, but at every beat there's a chance that it will jump to a different part of song that happens to sound very similar to the current beat. For beat similarity the uses pitch, timbre, loudness, duration and the position of the beat within a bar. There's a nifty visualization that shows all the possible transitions that can occur at any beat. Built at Music Hack Day Boston 2012.

New Japanese words every day, with kana, romaji and kanji. And colorful pictures, just in case.

An online dictionary to look up Japanese compound verbs (e.g., 仰ぐ "look up to" + 見る "see" = 仰ぎ見る "lift one's head and look up").

How well do you see color? FACT: 1 out of 255 women and 1 out of 12 men have some form of color vision deficiency. Take the online color challenge, based on the Farnsworth Munsell 100 Hue Test.

SSL certificates are signed using a one-way hash — usually SHA-1.

Which is too bad, because SHA-1 is becoming dangerously weak. It's time to upgrade to SHA-2.