Voicemod
Still the default voice changer for Discord and stream setups, and the free tier is usable — but the company has stopped publishing prices, which is an odd thing for a consumer app to do.
Pros
- Operates at the system audio level, so any application picks it up without integration
- Free tier is genuinely usable, just on a rotating subset of voices
- VoiceLab allows custom voices rather than presets alone
Cons
- No pricing page on the site — the price only appears after installing
- Windows and macOS only
- Free tier rotates its voice selection and caps you at one soundboard
- Real-time processing adds noticeable CPU load on weaker machines