Vosk is an open-source, offline speech recognition toolkit. Supports many languages and works on various platforms, including embedded systems and mobile devices. Good for privacy-sensitive applications. Works offline, even on lightweight devices - Raspberry Pi, Android, iOS. Installs with simple pip3 install vosk. Portable per-language models are only 50Mb each, but there are much bigger server models available. Provides streaming API for the best user experience (unlike popular speech-recognition python packages). There are bindings for different programming languages, too - java/csharp/javascript etc. Allows quick reconfiguration of vocabulary for best accuracy. Supports speaker identification beside simple speech recognition.