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If it’s just an issue with Rails, then might I suggest looking at https://hanamirb.org - it’s a framework, but one built from the lessons learned from rails and all who followed.
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Other people have given you alternatives to Rails. I recommend checking out Roda, which uses rack.
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.