The best alternatives to Osmo Projector are Savvy, Learning Virtual Reality, and OnTrack. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
OnTrack uses keyword detection to make sure that the sites you are browsing are related to the specific subject you have selected. Multiple strictness modes are available, as well as a customized whitelist for mandatory sites to stay unblocked.