The library format concepts are quite different, so using them directly probably won't be possible. But there is a Eagle converter somewhere in the sourcecode (

The library format concepts are quite different, so using them directly probably won't be possible. But there is a Eagle converter somewhere in the sourcecode (although it's not exactly userfriendly) :) But creating or generating own high-quality libraries is surely the better way forward. See https://github.com/LibrePCB/librepcb-parts-generator https://github.com/LibrePCB/librepcb-parts-generator