If you want the exact mathematical process Bitspeek uses, these open-source tools are your best bet.
: A free, open-source guitar amp simulator that includes a variety of effects, including overdrive and distortion, which can be used to add warmth and grit to sounds. bitspeek free alternative
If you love Bitspeek for its synthesized text-to-speech quality, Alter/Ego is the ultimate free tool. Unlike a standard effect plugin that processes live audio, Alter/Ego is a real-time singing and speech synthesis engine. If you want the exact mathematical process Bitspeek
如果你只想得到那种纯粹的“电子玩具”质感，而不需要复杂的参数调节，SpeakNSpell80是效率最高的选择。 including overdrive and distortion
These won't do the pitch-to-synth trick of BitSpeek, but they will destroy your audio in a similar lo-fi, speech-twisting way:
Type your lyrics into the plugin and trigger the notes via MIDI. Platform: Windows and Mac (VST, AU, AAX).