Someone

root@OpenWrt:/# xmms2 plugin_list
null - null output plugin
alsa - Advanced Linux Sound Architecture output plugin
wave - Wave decoder
lastfmeta - last.fm metadata
daap - Accesses iTunes (DAAP) music shares
normalize - Volume normalizer
asf - Advanced Systems Format demuxer
asx - Playlist plugin for Advanced Stream Redirector files.
curl - HTTP transport using CURL
cue - Playlist parser for cue files
m3u - Playlist parser for m3u's
id3v2 - ID3v2 tag container handler
mad - MPEG Layer 1/2/3 decoder
mp4 - MPEG-4 Part 14 file format demuxer
nulstripper - Strips leading NUL bytes
oss - OpenSoundSystem output plugin
pls - Playlist parser for PLS files.
lastfm - last.fm stream transport
xml - XML plugin
flac - Free Lossless Audio Codec decoder
replaygain - Replaygain effect
icymetaint - Decode & use shoutcast stream metadata
equalizer - Equalizer effect
ringbuf - Buffer
magic - Magic file identifier
converter - Sample format converter