Planner VPP is a good passage planner.
OpenCPN's weather_routing_pi using climatology_pi (35 years of Noaa wind
data) is comparable to Visual Passage Planner. I believe weather_routing is more complex to configure but there are more options and controls. (My experience with VPP is from some time ago.)
In addition weather_routing also uses Grib predictive weather
data, so it can assist planning in both a very general way and more specifically in smaller scale with current