(X)Fig is a menu driven tool that allows you to
draw objects on the screen of an X workstation; transfig
is a set of tools which translate the code fig produces to
other graphics languages including PostScript and the LaTeX
picture environment.
Fig and transfig are maintained by Brian Smith. Another tool for fig conversion is fig2mf which generates Metafont code from fig input.
There's no explicit port of xfig to windows (although it is believed to work under cygwin with their X-windows system). However, the program jfig is thought by many to be an acceptable substitute, written in Java.