There are many alternatives to DroidCam for Linux if you are looking for a replacement. The best Linux alternative is Iriun Webcam, which is free. If that doesn't suit you, our users have ranked more than 10 alternatives to DroidCam and five of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to DroidCam are DroidCam OBS, SmartCam, Audio Source and BigCam.
Transforms a phone camera into a wireless or USB webcam for Windows and macOS, supports up to 4K resolution, works with video and audio conferencing apps, enables automatic WiFi or wired setup, and requires drivers plus companion applications for full compatibility.
SmartCam - Smart Phone Web Camera - Turns a camera phone (S60, WinMo6.x, Android, Samsung Bada) with bluetooth or WiFi into a handy webcam ready to use with your PC.
Audio Source forwards Android microphone audio input to the PulseAudio daemon through ADB, so you can use your Android device as a USB microphone.
BigCam is a universal webcam control center developed by the BigLinux community. It allows you to manage and enhance the use of cameras on Linux, offering features ranging from support for professional cameras to the use of smartphones as webcams.
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It's better than droidcam. it has autofocus and a better resolution when recording.