espec
espec is a very simplistic emulation of the 48K ZX Spectrum. It only emulates a PAL ZX Spectrum, and just supports TAP files. It's mainly so I could test my Z80 emulation.
It's in C using SDL2, so should be portable to any UNIX-like operating system that supports SDL.
Version 1.0 is available here. The latest version of the sources are available here.