Translations:FAQ/205/en

Note that the top-5 networks use their own IRC software because (presumably) they want development to be under their own control and design their own network-specific features. UnrealIRCd, on the other hand, is very customizable and should be suitable for all networks. You can tweak a lot of configuration settings and load or unload modules to suit your needs, without ever needing to touch any source code. You can also load 3rd party modules from people other than the UnrealIRCd team or code one yourself (if you know C).