And can you name those lightweight tools, which work together nicely, use fewer resources and do almost everything foobar2000 does?
Here's a short list of requirements:
1. proper gapless-playback (which eliminates all GStreamer based players)
2. DSP support (during playback and when converting files)
3. ReplayGain support
4. Something like:
http://wiki.hydrogenaud.io/index.php?title=Foobar2000:Title_...
which works everywhere (converter, tagger, searching, UI (columns, window title, status bar, ...), album art fetching, grouping, ...)
5. an SDK to allow equally powerful plugins
6. Custom keyboard shortcuts for everything (e.g. quickly switch the current DSP profile when you plug in headphones)
7. Auto-playlists
8. Automatically detect changes in the file system and update library accordingly
9. A powerful query language: http://wiki.hydrogenaud.io/index.php?title=Foobar2000:Query_...
10. CUE sheet support