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Synthesizer V is an innovative music creation tool leveraging a deep neural network-based synthesis engine to produce remarkably realistic singing voices. It features customizable AI pitch generation, unlimited tracks, no core restrictions, VST3/AU plugin compatibility, ASIO support for Windows, Jack support for Linux, Cross-Lingual Synthesis, AI Retakes, Isolated Aspiration Output, Vocal Modes, Tone Shift parameter, Microtonal Adjustment, MIDI keyboard support, a metronome, and Lua/Javascript scripting. This appears to be a groundbreaking tool. (You will need to translate the page from Japanese to your preferred language)

Fliki is an AI-driven tool that enables content creators to convert text into videos using natural-sounding voices in any language. It includes an extensive stock media library and lets users personalize subtitles with their own branding. Additionally, it features realistic text-to-speech capabilities with more than 850 voices across 75 languages.

Quickie is an AI-driven extension enabling users to create text-to-speech, summaries, expansions, tweets, lyrics, and more. It also provides customizable quickies, allowing users to craft their own shortcuts using prompts and inputs. Quickie is available for free indefinitely with one quickie per credit, and there are paid options offering unlimited quickies, saved outputs, and limitless custom quickies.