A: Not natively. However, you can run the Windows EXE through Wine (on Linux) or CrossOver (on Mac). The audio latency may be higher.
XPSPeak 4.1 is valued for its straightforward interface that allows for rapid iteration of data models: xpspeak download
XPSpeak only sees voices installed in the Windows Speech API. To get more voices: A: Not natively
This is where XPSEAK shines and justifies the hassle of the download. XPSPeak 4
If you are a retro-computing enthusiast, a blind gamer needing ultra-low latency speech, or a developer who wants a scriptable TTS engine that fits on a floppy disk, XPSpeak is still unmatched. The fact that thousands of people still search for "xpspeak download" each month proves its enduring utility.
For very old versions, the may have preserved the original installer. Ensure the uploader is reputable.