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SimpleCov
Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites
Ensure that you have sufficient test coverage. You can use code coverage analysis tools like SimpleCov to gain insight into gaps in your coverage.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Audit the queries in your application. Are there any that are unnecessarily complex or inefficient? Do you have any N+1's? A tool like Bullet can help to find inefficient queries at the outset and prevent issues in production.
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.