Try https://github.com/alphacep/vosk-api. It supports 10 languages, works on Android and RPi and also has big and more accurate server models.

Other good ones are https://github.com/daanzu/kaldi-active-grammar and https://talonvoice.com/

There are toolkits for research like https://github.com/kaldi-asr/kaldi, https://github.com/espnet/espnet, wav2letter, Espresso, Nvidia/Nemo, https://github.com/didi/athena. You can try them too if you want to go deep. Some of them have interesting capabilities.