Abus
ABUS
TVIP11550
This is a WLAN Megapixel Kamera which works very well with Linux and ZM. See the German Amazon Product Description and also ABUS product info.
The camera supports MPEG-4 and H.264 streams, ZM 1.24.2 supports only the MPEG-4 stream and dies on the H.264 stream (but this might be an ffmpeg issue). Of course also the MJPEG and JPEG variants can be used but require a much higher bandwith. With MPEG-4 you get a very good quality stream (1280x1024@15) with a bandwith 6MBit/s which is also no problem over WLAN.
The camera is very Linux compatible, only the alarm zone configuration for the camera-internal motion detection requires IE. Since I use ZM I do not use this feature at all, everything else is Firefox compatible. The wealth of settable options shows that this camera belongs to the semi-professional market and is well above the typical Chinese cheapomatic camera.
Streaming source is rtsp://<camera>:554/video.mp4
and one must set the picture size to 1280x1024. I disabled the authentication for the video stream at the camera.
There are also other models which lack some or all of WLAN, IR, Megapixel features. These should also be compatibel but I did not test them.