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waydroid
Waydroid uses a container-based approach to boot a full Android system on a regular GNU/Linux system like Ubuntu.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
For me it's https://github.com/debauchee/barrier
Fun fact, SurfaceFlinger is more-or-less compatible with Wayland's graphical model that it makes low-cost compatibility layer (e.g. WayDroid)
Those that have contributed to "http://gitlab.freedesktop.org/wayland/wayland", especially those that are paid by Red Hat to contribute.
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.