Freeware for optical spectroscopy. Easy to use, fast and reliable. Viewing optical Spectra (UV/VIS, IR, NIR, Raman, fluorescence) from different sources. Supported data formats include ASCII, JCAMP-DX, Galactic SPC, Perkin Elmer, Varian Cary 50, Scinco Neosys 2000, Bio-Rad FTS 3000 MX, Agilent/HP 8453, Avantes Avasoft, Milton Roy Spectronic 3000, Roper Scientific/Princeton Instruments WinView/WinSpec. Displaying and processing many spectra simultaneously. Exporting data as ASCII, Galactic SPC or binary data as well as graphics files (WMF, GIF, PNG, TIFF, BMP). With a special focus on parameter calculation and manipulation of absorption and fluorescence spectra (e.g. eXtinction coefficients, fluorescence Quantum yields).