is a ZX Spectrum app designed to view different type of Speccy files: music, graphics, texts & a lot more.
is the answer you've awaited for. It has 2 years history, hundreds hours of programming and good UI/UX. As you may see from the name, there are no analogs at the moment.
will only work properly on
Minimum configuration: Pentagon 128k.
If you have ZX Evo with TS-Conf then The Viewer will use all 14 Mhz.