I see the following plugins in the default roundcube plugin directory:
acl
database_attachments
example_addressbook
http_authentication
newmail_notifier
redundant_attachments
userinfo
zipdownload
additional_message_headers
debug_logger
filesystem_attachments
jqueryui
new_user_dialog
show_additional_headers
vcard_attachments
archive
emoticons
help
managesieve
new_user_identity
squirrelmail_usercopy
virtuser_file
autologon
enigma
hide_blockquote
markasjunk
password
subscriptions_option
virtuser_query
While some of them are fairly obvious, some are not. I've Googled and searched the Wiki, but can't seem to find a reasonably detailed listing of what each plugin does. Any guidance is appreciated!
I'm not sure that a general list exists, most of the plugins have a README or the plugin description in the top of the main plugin file.