So it comes down to emotions, feelings, and politics rather than facts. Thanks for at least admitting it.
Every thread remotely related to this topic will be alike because most here act purely on their emotions and feelings and politics rather than purely on hard facts.
Well, there's a lot...really too many to list. Do you have a specific need? One very popular tool I'll offer as an example is gretl another is MATLAB. I do most of my plotting/charting with R and I'm very happy with that. I can also recommend pyplot. You can always ask the vendor. Does it have to be compiled? Many things these days are interpreted and, if you're not working on proprietary HFT sorts of things, interpreted software can be run in production without a great performance concern. I won't deny that the "paradox of plenty" may apply here. So it can be a challenge to balance capricious excursions with the focused, specific and deliberate. Be careful not to chase your tail.
Yeah, there's 15 gazillion of these things... here's yet another one. I'm more of a back-end processing type of person and not a big "trade from charts" person but these days anything worth it's salt is cross-platform.