Haxe : because it can target web, desktop and mobile with the same code for apps and games , and allows for declarative UI building. eXist-DB : XML DB with bak

Haxe : because it can target web, desktop and mobile with the same code for apps and games , and allows for declarative UI building. eXist-DB : XML DB with baked in app framework. Server side code is in XQuery. Magic for data aggregation API building. PicoLisp : Lisp + declarative Web UI + prolog + distributed DB in one tightly coupled package. Build your next crawler in this to appreciate the magic.