ZX32 Spectrum Emulator is a program that can emulate a ZX Spectrum in your PC.
A remarcable software emulator of the Sinclair ZX Spectrum series.
Stephen Computer Services, Inc.
It is a software package simplifying the SPC tasks data collection and charting.
Pico Technology Ltd
PicoScope is a complete test and measurement lab program.
Spectacular Rainbows Free Screensaver includes lots of images with rainbows.
iNMR reader is a professional app that allows you to print a spectrum.
Fuse (Free Unix Spectrum Emulator) is, unsurprisingly, a ZX Spectrum emulator.
MDS Audio Spectrum Analyzer is designed for real time audio spectrum analysis.
Run famous race courses, running routes, and trails with this running simulator.
Full Spectrum Warrior is a squad-based, real-time combat game.
Spectrum analyzer for Steinberg VST plugin format.
Blue Cat Audio
Blue Cat's FreqAnalyst is a free spectrum analyzer plug-in.
ZX Spectrum Emulator - Emulate the original 16k, 48k, 128k, +2 models.
Spectaculator is a Sinclair ZX Spectrum emulator for Windows.
Colors is an application that provides a fun look at the spectrum of colors.