MyNoise - Custom shaped online noise machines. Many Many generic sounds
Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
Text-Generator.io - Self Hostable OpenAI Alternative
Studiowave - Chillout tunes and inspiration
Tide - Tide is probably one of the most popular relaxing and productivity boosting platforms available over the internet.
Tingles - Watch ASMR videos on your phone. Videos that make you tingle