The developer, IlTimido released a new C64 frontend for Windows called C64 Memories. This frontend focusses on manageability of the big TOSEC  collections.

C64 Memories features:

• Full support for Tosec naming convention: displayed data about games are taken directly from the filename.
• Supports nearly all C64 images: .D64 .T64 .TAP .PRG .P00 .D71 .D80 .D81 .D82 .G64 .G41 .X64
• Comes with a C64 emulator: C64 Memories uses a slighlty modified version of Vice2.2 emulator.
• Directories display: the list of the content of a .D64 or .T64 file is displayed in automatic by C64 Memories.
• Favorites folder: you can add your favorite games in the favorites folder (and every disk/tape of a sequence is added in automatic).
• Search filters: you can filter results for the first letters, substrings and you can show only the first disk/tape of a sequence.
• Snapshots galleries: your can take screenshots from inside the games and the pictures will be displayed in automatic in C64 Memories.
• Notes: you can add custom notes for every single game.
• Ratings: you can rate every single game.
• Search providers: you can easily find additional informations (review, screenshots, remake, music) over the Internet for every single game just by pressing a button!

source: c64scene.com c64memories