KiCAD

Getting Started in KiCad
PcbNew Features - Push and shove router

Import Eagle to KiCAD

Eagle SCH/LIB to KiCad SCH/LIB ULP conversion script
Quick Introduction Video
Kicad Import formats, esp. Eagle

KiCAD Library

DC/DC power supply MC34063, and many others.
My personal library of KiCad schematic symbols and footprints
KiCad libraries generated from the STM32Cube database
Official KiCad Footprint Libraries
Official KiCad schematic symbol libraries
3D Models

Loading library to KiCAD

How to make Kicad schematic libraries load with a relative path