I recently obtained a Sony prs-505 and immediately went looking for a way to manage 'collections'; mngr505-1.12 does that and more, without being overfeatured. It's fast, straightforward, to the point and reliable. I can't say much about support as none appears to be needed. mngr505-1.12 simply does the jobs it's supposed to do. The source and a readme are available and sufficient, I think. Great stuff!