Lorenz

lxz = Import["lorenz-xz.dat", "Table"];

ListPlot[lxz]

lxy = Import["lorenz-xy.dat", "Table"];

ListPlot[lxy]

lyz = Import["lorenz-yz.dat", "Table"];

ListPlot[lyz]

lxyz = Import["lorenz-xyz.dat", "Table"];

<< Graphics`Graphics3D`

ScatterPlot3D[lxyz]

van der Pol

vdx = Import["vdpolx.dat", "Table"];

vdy = Import["vdpoly.dat", "Table"];

g1 = 
      ListPlot[vdx, PlotJoined -> True, 
        PlotStyle -> RGBColor[0, 1, 0]]

g2 = 
      ListPlot[vdy, PlotJoined -> True, 
        PlotStyle -> RGBColor[0, 0, 1]]

Show[g1, g2, Frame -> True]