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My current favorite program, Xoscope, gives your sound card digital oscilloscope capabilities. It has most of the features you expect in a digital oscope (except a MHz bandwidth), like memory, autotrigger, etc. It runs under X windows for GNU/Linux, and some other platform.

I've made xoscope rpm's for RedHat 6.0, which are available here:

• xoscope-1.5-3.i386.rpm
• xoscope-1.5-3.src.rpm

This is the cool new version, which uses GTK+. See also the Xoscope homepage.

Here's a screen shot of the old version (which used Athena widgets).

Rpm's for some of the Caltech Chipmunk Tools are available here. These are CAD design tools for circuits and VLSI chips.

Again, these are i386 RedHat GNU/Linux rpms.

• chipmunk-docs-1.2-1.i386.rpm
• chipmunk-docs-1.2-1.src.rpm

Chipmunk Tool docs have been html'ized and centralized. This rpm installs the html tree under /usr/doc/chipmunk-doc-1.2.
• chipmunk-psys-1.40-1.i386.rpm
• chipmunk-psys-1.40-1.src.rpm

psys is a library which is necessary for all of the Chipmunk Tools. It is built here as an ELF shared object.
• chipmunk-log-5.40-1.i386.rpm
• chipmunk-log-5.40-1.src.rpm

log is a circuit design and simulation package. It includes a drag-and-drop circuit building interface.