web/docs/Backends.mdx
Acrarium is an open source backend created by the current maintainer of ACRA.
Acralyzer is an open source backend created by the original author of ACRA. It is currently unmaintained. It can be used as is, and is quite stable. But no support will be provided at the moment.
Tracepot is a hosted solution for anyone who needs a backend.
Most of these Backends should work with ACRA 5, but their documentation hasn't been updated, most are not in active development.
Is your backend in this section? Update your documentation and move it up!