Wikipedia IPA Reader
If you click on IPA (international phonetic alphabet) text on wikipedia, it links to a generic IPA page, which I always found frustrating. I created a chrome extension which adds a play button next to IPA text to read it aloud.
Done in an afternoon, it’s almost certainly the highest users:time ratio of any project I’ve done. It simply extracts the IPA text from wikipedia and then uses Amazon Polly, a text-to-speech service provided by AWS to generate sound.