SourceCoder is a full-featured web IDE for programming graphing calculators, supporting TI-BASIC, assembly, C/C++, and other languages, and including an embedded calculator emulator.
jsTIfied is an online graphing calculator emulator, emulating z80 calculators (TI-72, TI-82, TI-83, TI-83 Plus, TI-83 Plus Silver Edition, TI-84 Plus, TI-84 Plus Silver Edition, and TI-84 Plus C Silver Edition). Written in 2011, it runs entirely in-browser using HTML5 and Javascript, so it requires neither Java nor Flash, at the time a novelty.
WorldTrends was a web application to track headlines and trends across news and financial sources and eventually extract events correlated with results.