SoundBoost Text to Audio (https://mastering.soundboost.ai/text-to-audio) generates audio clips from 1 to 30 seconds from an instruction: sound effects, textures, moods, and music samples.

Recent generations of users are displayed in a public list, with listening and downloading.
The generations are announced as royalty-free, including for commercial use.

Model used not specified. Interface in English.

Note: Some instructions may be better interpreted in English than in French. Unconvincing voice.

Free tool from SoundBoost, a paid AI audio generation platform. Builds with accounts and listens to examples possible without an account. Seems unlimited.