SMath Studio 0.97.5890 + Portable | 2.1/3.7 Mb
Tiny, powerful, free mathematical program with WYSIWYG editor and complete units of measurements support. It provides numerous computing features and rich user interface translated into 38 different languages. Application also contains integrated mathematical reference book. Application can be easily extended based on your needs. Built-in Extensions Manager tool allows to get access to hundreds official and third-party resources.