Feynman diagrams in LaTex

[Morberticus]

Does anyone here use the package feynmf to generate feynman diagrams? I can use it to build diagrams, but I don't know how to build sums of diagrams

i.e. diagramA + diagram B + diagram C

Does anyone know how to do this? Thanks

[Manojg]

Here is a good one http://feyndiagram.com/. Written in c.