eTcl is a "batteries-included" thread-enabled Tcl/Tk runtime available as a single standalone executable. It includes several popular Tcl (Thread, Sqlite, Zlib, ...) and Tk (tkTable, treectrl, htmlwidget, ...) extensions, together with a Tcl wrapper for the Pixane image processing library, and other exclusive packages (evodio for audio support, scene for 3D widget, ...).
Binaries, support and updates can be found at https://www.evotcl.com/.
eTcl is available for a large set of platforms, including Win32, macOS, Linux (for several architectures including x86_64 and arm64). On any platform, executable requires no installation, and has no dependencies. Just copy executable wherever you want on your device and launch it.