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Pixel Shader - a neverending story. Depending onwhich platform you want to emulate, on which platform you host, which hardware you throw into the ring for displaying your colorful pixels, as well as your personal taste, there are quite a few options.

@rsn8887 has just added another one. Namely one for friends of cultivated CRT screens. The special feature: Sharp pixels, no distortion and no to very little blurring make the Shader the ideal companion, if you want to render your scanlines on the analog way to the eye and not before.

Platforms and applications are somewhat limited, but perhaps in the intersection with things that are relevant to you.