ZBar is an open source software suite for reading bar codes from various sources, including webcams. This is the main repository for reporting issues and send PRs. There's a clone at at https://git.linuxtv.org/zbar.git/, and another one at https://gitlab.com/mchehab_kernel/zbar.
WebRTC streamer for V4L2 capture devices, RTSP sources and Screen Capture
RTSP Server for V4L2 device capture supporting HEVC/H264/JPEG/VP8/VP9
akvcam, virtual camera for Linux
Cross-platform TV player for live/recorded streams. Supports MPEG-2 TS & MMT/TLV in a unified Win/Mac/Linux UI.
Use your Android phone's camera and mic as a webcam and microphone on Linux over USB : 100% local, nothing to install on the phone. One Bash script: scrcpy + v4l2loopback + PipeWire.
Webcam preview and V4L2 controls for the Omarchy bar