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Zoneminder
ZoneMinder is a free, open source Closed-circuit television software application developed for Linux which supports IP, USB and Analog cameras.
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Another popular open source option is ZoneMinder. It's much more feature rich than Motion but also heavier. Probably the oldest OSS NVR.
Frigate (also free OSS) has been making some waves lately but I haven't tried it yet.
It's proprietary nagware pretending to be open source. Read the License.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.