SHP to KML Converter is a free online GIS application. You can also try many other formats for converting. Also this tool allow to change a spatial reference system for the output file....topojson shp, dbf, shx, cpg, prj, qix mif, mid tab, map, id, dat gdb...KMZ, SHP, DBF, SHX, CPG, PRJ, QIX, ZIP, MIF, MID, TAB, MAP, ID...