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You can build PDF using prawn-rails if you prefer a declarative approach (and don't mind using GPLed code).
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Scout Monitoring
Performance metrics and, now, Logs Management Monitoring with Scout Monitoring. Get early access to Scout Monitoring's NEW Ruby logging feature [beta] by signing up now. Start for free and enable logs to get better insights into your Rails apps.
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Pdfkit
A Ruby gem to transform HTML + CSS into PDFs using the command-line utility wkhtmltopdf (by pdfkit)
Alternatively, there tools like pdfkit if you want to build off HTML pages (and are happy to deal with wkhtmltopdf and it's older style CSS).
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.