Scilab Wavelet Toolbox, is designed to emulate Matlab Wavelet Toolbox. Combined with Scilab Image processing toolbox on sourceforge, one could do image wavelet processing the way as the Matlab user does.
Emu48 for Mac OS X is an emulator for HP calculators. It is a port of Emu48 for Windows and uses the same ROM images and interface skins. Currently it can emulate the HP49/48/40/39/38 series calculators. More info: http://emu48mac.sourceforge.net/