Altium2kicad can help you migrate an Altium project to KiCad, it supports most features of .PcbDoc and .SchDoc, so it can convert both the PCB and schematic. It consists of a few perl scripts that are executed on the altium design files.
Eeshow is a collection of programs that read schematics made by KiCad’s Eeschema. Eeshow can be used as interactive viewer, or as a command-line tool to convert schematics to PNG, PDF, Postscript, EPS, or FIG.
Eeshow can show the differences between two versions of schematics sheets and it can retrieve files directly from a git repository.
Eeshow was developed as part of the Neo900 project.
Footprints tend to be highly repetitive, with many pads placed in a simple geometrical pattern. With fped, the user specifies the elements to repeat and the way they are repeated. Fped then generates the repetitions automatically.
KiCad StepUp is a FreeCAD Workbench aimed at helping both KiCad and FreeCAD users in collaborating with electrical (ECAD) and mechanical (MCAD) design.
Load kicad board and parts in FreeCAD and export it to STEP (or IGES) models
kicad_mod footprint in FreeCAD to easy and precisely align the mechanical model to kicad footprint
Pull a pcb edge from a
kicad_pcb board, edit it in FreeCAD Sketcher and push it back to kicad
Push & pull 3D models positions between FreeCAD and KiCAD
KiCost is intended to be run as a script for generating part-cost spreadsheets for circuit boards developed with KiCad. It works by scraping part distributor websites to get part pricing. Additionally, KiCost supports other bill of material files from other EDAs which is useful for older projects and it can even handle hand-made CSV files. KiCost also comes with a graphical user interface in addition to command line.