Geany - Lightweight IDE for Linux and Windows
WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.
BlueGriffon - An HTML editor based on Mozilla rendering engine.
Numi App - Numi is a beautiful text calculator for Mac.
Adobe Dreamweaver - Adobe Dreamweaver is a proprietary web development tool developed by Adobe Systems.
Graph - Graph is an open source application used to draw mathematical graphs in a coordinate system.