What charitable organizations take used computers?

We want to donate three computers to one or more charitable organizations (that is, organizations which the IRS recognizes as charitable). These computers date from circa 1996 to 2002; they have 200 mHz to 1 GHz processors, 3 GB to 80 GB hard drives, and old-fashioned CRT monitors. They're fully functional, but have trouble running modern software. Their hard drives are wiped clean (no software is included). Does anyone know of any charitable organizations that would be interested in having them? These might, for example, be organizations that would give them to families that otherwise wouldn't have a computer.