Sigma 50mm, 70mm, 105mm, 150mm, 180mm
Canon 60mm, 100mm, 180mm
Tamron 90mm
are all true 1:1 macros, there are others as well but these are the most popular.
A lot of zoom lenses now have a macro feature but at best they only deliver a 1:2 ratio and the image quality isn't nearly as good as a dedicated prime lens.