That holds mostly for either a) software that&#x27;s made by software developers for software developers, and b) software that&#x27;s utterly trivial. It&#x27;s not true for most tools for professionals.<p>To name few examples - there&#x27;s no decent alternative to Microsoft Office (free or otherwise), there&#x27;re no decent open source alternatives to most CAD applications, to MATLAB (no, Octave doesn&#x27;t count) &amp; Simulink, LabVIEW, musical software, electronics design &amp; manufacturing, etc. Essentially anywhere where the problem domain is nontrivial and the potential audience is limited.