SAM is queued for analysis. Crawling candidates and ranking them takes a few minutes. This page updates itself when the list exists — you can also come back later.
What is known so far comes from the other direction:
These projects were analysed and named SAM among their alternatives. The relationship is not symmetric — how SAM rates them is a separate judgement, made when SAM is analysed in its own right.
calls SAM “choose if you want a tiny retro 1980s formant synthesizer for historical/hobby use; it is far narrower and unmaintained.”
eSpeak NG is an open source speech synthesizer that supports more than hundred languages and accents.