WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.
Geany - Lightweight IDE for Linux and Windows
SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
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.