Marketscore offers a free accelerator but with a trade off.

Free dial up internet tips: It is possible for a consumer to keep their current dial up account and add a free dial up accelerator. This is made possible by online research companies who are willing to give consumers a free dial up accelerator in exchange for allowing them to track where the consumer surfs the net as part of an online research project. One such free dial up accelerator offer comes from Marketscore and it includes free email virus protection by Symantec as well. The software will provide a connection at up to 78% faster than the consumer's current dial up connection, page downloads will be quicker, connecting to websites will be faster, and limited communication delays. All the consumer needs to do is join Marketscore's internet research community to allow them to track the consumer's internet usage to provide companies with internet trends and patterns. Marketscore will not share the user's personal information as their reports are kept anonymous and their research is confidential. This is a great deal for user's who want a free dial up accelerator but do not want to pay the additional fees their current ISP will charge.