Bill Moninger's NOAA Interactive Skew-T site remains the best and easy to use way of displaying meteorological soundings for soaring forecasts.
http://rucsoundings.noaa.gov/gwt/
I've been using
RAOB.COM commercial product for the last couple of years. It's even better, but much harder to use with many user interface options including a time series. The time series cross section was used recently for my thermal forecasts at the 2014 Nationals in Montague/Yreka. RAOB is more a professional project with a price of around $200 by the time one adds necessary modules. BUFKIT is easier to use, free but only works with model BUFR or BUFKIT text soundings.
http://wdtb.noaa.gov/tools/BUFKIT/index.html
While attending the American Meteorological Convention Phoenix in early January I came across this:
SHARPPY - Open Source Community Supported Sounding Analysis for the Future
http://bit.ly/sharppyams2015
Unfortunatley, it's still in Alpha or Beta while being developed by some young Python programmers and storm chasers at the University of Oklahoma.
Don't even bother looking at this unless you are a programmer... hopefully into Python. I think it's very promising as a community project. All the thermodynamic libraries are in there for doing the soaring calculations. Right now, SHARPPY can be run from this Git repository:
https://github.com/sharppy
I haven't tried it myself... It's on my TODO list.
Walt Rogers WX