Modem Max - description from Softdepia.com:
ModemMax is an Internet accelerator that optimizes your connection speed 200 percent or more by adjusting seldom-used Windows registry settings. ModemMax offers a built-in Speed Test function that allows users to see the differences in connection speeds before and after optimization.
ModemMax works with Windows versions 95, 98, and Me, and can be used with both Internet Explorer and Netscape. ModemMax also supports 56K modems and broadband connections, including cable and DSL.
Modem Max is a "Free to try" program. You can download and try it for an evaluation period.