Wide coverage translation with GF
The Human Language Translator: a mobile speech and text translation app for Android.
Phrasomatic (conceptual authoring based on Phrasebook)
MOLTO Application Grammars
GF online editor for simple multilingual grammars
(there is also an older prototype)
Online syllogism solver
Minibar (Predecessors: Fridge poetry | Word-completing translator)
Question answering demo for simple math questions.
Tramdemo on YouTube: find your way in Gothenburg public transport system, in six languages (film).
Numeral translator for the iPhone: number words in 15 languages.
Numeral translator: number words in 88 languages. (Java applet)
Letter editor: compose a letter in a language you don't know. (Java applet)
Pizza: order a pizza by speaking to your web browser.
WebALT Math Editor: create mathematical exercises in six languages simultaneously (film).
[Out of order, early May 2012] WebALT Math translator: translate mathematical exercises in a web service using incremental parsing.
Library API browser-editor: construct phrases in the GF resource library