Verdict: Partly
Partly. SketchUp Desktop is Windows and Mac only, with no Linux version. SketchUp for Web runs in Chrome, Firefox or Edge and works on Linux, and it opens your existing .skp files.
Trimble's hardware and software requirements page lists Windows 11 and recent versions of macOS for SketchUp Desktop. Linux is not mentioned, and there is no Linux installer.
SketchUp for Web is the genuine answer here. Trimble's own help says it recommends the latest Chrome, Firefox or Microsoft Edge, and that it relies on WebAssembly, a browser technology those three support. Your models live in Trimble Connect cloud storage, and a Trimble ID comes with 10GB of it. You need a mouse and keyboard, and a scroll-wheel mouse makes orbiting much easier. On a Linux laptop with Chrome or Firefox this works, and it is the same .skp files you already have.
Be clear about what the web version is not. It is a smaller product than SketchUp Pro. Extensions from the Extension Warehouse do not run in it, LayOut for producing drawing sheets is desktop only, and some import and export formats are missing. If your work depends on a particular extension, the browser version will not save you. Check the plan comparison against your own habits, because the free web tier is more limited again than the paid one.
Your .skp files are safe either way, because the web version opens them. If you would rather leave SketchUp entirely, export models to DAE or STL first. FreeCAD reads those, though SketchUp's loose push-pull modelling and FreeCAD's precise parametric approach are different ways of thinking and the models rarely arrive tidy.
Free and precise, with a BIM workbench for building design. The modelling approach is stricter than SketchUp's and takes real relearning.
Your files: Cannot open .skp. Imports DAE, STL, OBJ and IFC exports, usually needing cleanup afterwards.
Better than FreeCAD if your SketchUp work was about how things look rather than how they are built. Strong rendering, no dimensions or drawing sheets.
Your files: Cannot open .skp. Imports DAE, OBJ, FBX and STL exports.
A narrow option for simple geometric objects defined by numbers. Nothing like SketchUp to use.
Your files: No .skp support. Works in STL and DXF.
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