Short version: Any suggestion on an Open-Source Software alternative to Grapher/Surfer/Origin/SigmaPlot?
Details: This is not a shopping question. As a scientist I explore and plot data all the time. I have been using Grapher, Surfer, SigmaPlot and Origin... all good ones. But I want to move on to Open Software (an evolution from the point of view of open science, but that's another discussion).
Can you recommend good programs (software) within the open software realm which fits the "plotting" objective? I mean, I don't need it to do statistical analyses (I use R for that), I just want to plot data. If possible it should be usable through a GUI (ie graphically-oriented like those mentioned above, not command-line). This means I want a point-and-click approach, as I think this saves a lot of time by being more intuitive (this opinion could be challenged, but that's not the point of this question).
Also I would like a program which is "popular", ie if I don't understand something I can check forums, etc. rather than find out by myself because I'm one of the 15 users of the program..
Any suggestions? what are the most used and why? have you tried one? This question may seem more fit for other forums (softwarerecs?) but I'm looking for opinions/suggestions from users of the Academia/Research world who are not necessarily "technical enough" to sing up in softwarerecs (audio, web apps, wifi, etc.). Therefore I think the most useful answers will come from this forum and not a software-related one. I think best answers will come from professors, scientists, students, technicians, etc. who work plotting data from different disciplines while they may not care (or not know) about drivers, OS, programming, etc.