The best alternatives to Airdroid 3 are Plover, Just Stream, and DaftCloud. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— The most accurate API for conversational speech-to-text
Tired of using Airdrop only for Apple devices? Tired of sharing links and getting people's emails? Plover.io is a browser based file sharing made easy. See everyone on your local network and send files! All you need to do is go on the link. Don't worry we delete your files automatically afterwards too.
Stream audio and video direct from your Mac or mirror your Mac screen with sound to Chromecast, Smart TV, Apple TV or any DLNA compatible device. No wires or cables required. All video formats and resolutions are supported, including 4K, HD or Ultra HD.
This extension allows you to watch your favorite online videos on your Roku & Chromecast. You just need to create an account on https://kastfy.com where you will be presented with very simple instructions to cast the videos.
JustStream can stream media and screencast to a TV, all the while maintaining a compact form with low CPU use. Broadcast your media in any format, any resolution (including Ultra HD), and most importantly, without the need for any cables.