I'm doing this as well as freelancer. Mostly I work on an opensource project that day, sometimes I use it for learning something new. Reason I started this was that I do not have the energy to do such things on the weekend (otherwise I'm constantly tired at work) and I still did want some productive spare-time. Unfortunately as freelancer this means 20% less pay (at least in the short run) and you need a client allowing for that, but after doing that for more than year now I still feel it's worth it.
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I'm doing this as well as freelancer. Mostly I work on an opensource project that day, sometimes I use it for learning something new. Reason I started this was that I do not have the energy to do such things on the weekend (otherwise I'm constantly tired at work) and I still did want some productive spare-time. Unfortunately as freelancer this means 20% less pay (at least in the short run) and you need a client allowing for that, but after doing that for more than year now I still feel it's worth it.