Are there any good R object browsers?

Question

S-Plus has a great object explorer and data editor built into its GUI. It allows you to easily see all the objects in the workspace at a glance, and sort them by name, size

Answer 1

The StatET plugin for Eclipse, which provides a nice cross-platform IDE for R, LaTeX, and Sweave, has an integrated object browser for R once you suffer through the pain of getting it all set up.