But why is it not mentioned that open-source software is usually things that the developers themselves use in their life for productivity or otherwise. For exam

But why is it not mentioned that open-source software is usually things that the developers themselves use in their life for productivity or otherwise. For example, useful browser add-ons like TST or Sidebery. God knows how many cool things (scripts, programs) people use in their personal lives (that they don't get paid for) that they could "open-source" and share with the world and synergistically build to even greater heights. I guess it takes some work to make it modular enough for the public...