I wouldn't say I actively contribute. However, I do contribute when I need something done. For example, I need Spree (open source Rails e-commerce) to handle s3 downloads so I created and open sourced the s3 download extension. I needed attachment_fu (Rails attachment plugin) to use the GD library, so I forked and added that, which later got merged back in. I don't regularly spend a ton of time on open source stuff, but if I need it, I do it.
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I wouldn't say I actively contribute. However, I do contribute when I need something done. For example, I need Spree (open source Rails e-commerce) to handle s3 downloads so I created and open sourced the s3 download extension. I needed attachment_fu (Rails attachment plugin) to use the GD library, so I forked and added that, which later got merged back in. I don't regularly spend a ton of time on open source stuff, but if I need it, I do it.