I am looking for a single free software to draw easy schematic pictures, such as those for setting up physics problems and so on. You'd be able to draw arrows, lines, a bit of text, easy geometrical forms and so. I have heard about XFig, but it is needed Linux or Unix I don't remember. I tried some time ago to install it from a web page somebody gave me just here, but I wasn't able. Do you have some suggestion? Please, if possible I want it to be running under WinXP. Thanks.