I have a jetplan.com (Jeppesen) account, but I just opened a free three week trial account with Universal Weather.
Jetplan's software (according to Jeppesen) is based on the old dial-up modem technology. I agree that when filing an ICAO flight plan it must be edited manually each and every time to be accepted by Eurocontrol.
On the other hand, Universal Weather's flight planning is quite simple. So far I like their product.
Here is a link to their on-line
DEMO.
Sign up for a
free three week trial here. No credit card required.
Here are their
plans/pricing.