This has been done to death. There are various flight planning programs. The oldest VFR / Europe one is Navbox and the oldest more fancy VFR/IFR one is Jeppesen Flitestar. A more recent VFR prog with some European coverage is Skydemon. Then there are "GPS moving map" programs which have planning capability e.g. PocketFMS.
Simple laptop-based flight planning has been around before I started flying 10-11 years ago. No serious pilot has been using the slide rule etc for that time and I certainly don't.
Personally, what matters to be in a VFR prog is a good database where I can click on an airport and see the phone/fax # etc. I don't think anything beats Navbox on this, dated though it is now. IFR (airways) has different requirements.