I'm an advocator of Ruby's new debugger ruby/debug. Besides making consistent contributions to it (200+ commits and counting), I also help promote the project by writing Rails' debugging guideline and blog posts about it.

If you have any questions regarding debugging tools, debugging techniques, or OSS contribution, feel free to ping me on Twitter (@_st0012). And if you like the work I do, I'd appreciate any support you can give. Cheers!