If you're looking for something to replace Orb Plugins, WavTool is definitely worth a look. It has a range of tools, including a multi-modal music chatbot, MIDI continuation tool, audio generator and stem separation tool. WavTool supports VST & AU plugins and comes in three pricing tiers, so it can accommodate musicians at different levels of sophistication.
Another contender is Soundry AI, which is geared more toward text-to-sound abilities and unlimited sample packs. That's good for musicians who want to explore a lot of different variations on a sound without a lot of hassle, which can speed up production and open up new creative possibilities.
If you want something that'll generate beats, basslines and melodies based on your style, Beat Shaper could be the ticket. It can generate dynamic melodies and VST synthesizer presets, so it can be a useful tool to get past a creative block and get more out of your music production.
Last, Staccato is a broader music and lyrics creation tool. Its features include an AI Instrument that generates music loops and drum tracks, and an AI Lyrics Generator, designed to help you get past writer's block and improve your songwriting. It integrates with popular DAWs and notation software, so it's a pretty useful tool for musicians and producers.