AuctionCut

In the lister there is a section titled 'post auction rules', this is where you can set your items to automatically relist if sold or unsold. Checkmark your choice and input the number of times you would like the item to automatically relist.
You can also manage your relists under Auctions > Current, at the top of the page is a text link to manage your post sale rules.

Yes, I'm currently using Inkfrog

EZLister offers Performance Based Re-Listing. What this means is that you can set the sell through rate that a product must achieve in order for it to be automatically re-listed. As long as the item achieves a sell through rate that exceeds that desired, the item will re-list as long as their is inventory available. When the sell through rate falls below that desired, then the item does not re-list but is presented to the manager on a report. This allows the manager to review the performance of the item, determine the cause for its "undesirable" performance, make any changes found to be appropriate, and then to be re-listed so the process can start again. If you want items to re-list regardless of performance, then simply set the re-list rate to 0% and the product will continually be re-listed.