WHENEVER I hear of "Lagrange" I assume Joseph-Louis Lagrange, but Lagrange is actually a Gemini client/browser. Since Joseph-Louis Lagrange was also an astronomer it fits neatly into the space theme (capsules, Gemini, Moonlander and so on).
Today, for the first time, I've had the opportunity of taking Lagrange for a spin, or a space voyage. I've already tried more than half a dozen Gemini clients and this is by far the most powerful one, albeit it takes up quite a bit of RAM. A bigger complaint about it is the packaging format (or "installer" as some might call it). That will be largely a thing of the past once major GNU/Linux distributions add it to repositories (probably inevitable given the rapid expansion of Gemini space).
Here is Lagrange on Flathub. The video above shows it 'in action' or in flight. It crashed after about 10 minutes, maybe due to a conflict with the WM/Compositor or some bug in Lagrange itself. Either way, for those who have RAM to spare and want to customise a lot of things Lagrange is probably the best option right now. ⬆