caniemail.com
Can I Email? is a developer resource for coding, documentation, communities, security research, or software tools.
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caniuse.com
Can I Use? is a developer resource for coding, documentation, communities, security research, or software tools.
canyouseeme.org
CanYouSeeMe provides network diagnostics for checking connectivity, traffic, devices, or internet performance.
librespeed.org
Open source speed test service that can be self-hosted for bandwidth and latency checks.