And a controversial entry, NeoMod 'based' on LSD (it is infact not, its based on vanilla but with many LSD features):
Has been described as a leech mod because of:
a) it has community features [but lots of clients do, morph does I think too]
b) reask sources/kad/server [used too often can be classed as aggressive]
c) ability to kick people from queue [nuff said, don't do it unless you have an extremely good reason to do it, in most cases, its just incredibly bad for the network.... especially if you have a retarded notion that xyz is a leech! You wil be wrong, no doubt about it, and you will be treating that client unfairly. So caution using the feature, else i agree its a harmful feature.]
Technically, its not even close to a leech mod (ratio is in place, upload is constant and stable [infact huge releasing power due to many of its feautres], and 'do not touch' areas of code untouched unlike LSD mod), but the purists would argue it is, and i'd imagine it can be used very wrongly in the wrong hands. Be careful when using reask server/sources/kad, there is a delay, but if you repeatedly do it, you are hammering and will most likely get banned from clients.