ReactJS is a no-no from the get go. Facebook&#x27;s Patent grant on what is supposed to be an &quot;open source product&quot; is ridiculous: <a href="https:&#x2F;&#x2F;github.com&#x2F;facebook&#x2F;react&#x2F;blob&#x2F;master&#x2F;PATENTS" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;facebook&#x2F;react&#x2F;blob&#x2F;master&#x2F;PATENTS</a>. &quot;If you ever start a patent conflict with Facebook in court, (worse but even more likely:) or if Facebook starts a patent litigation against you, you LOSE all your rights to use React in ANY product throughout your company and MUST stop using it at once in your code!&quot; Imagine how that can bring a team down.<p>If folks know of anything out there that works like React (I like the ideas, including JSX) but isn&#x27;t hobbled simply by mis-virtue of being &quot;backed&quot; by the characterless evil that is Facebook, kindly enlighten me, I will use it.<p>I&#x27;m actually wondering if the new &quot;open source&quot; Parse code will have the same Patent horror built-in, and if yes that&#x27;s even worse considering backends can be even more complicated and important part of a company&#x27;s infra.<p>Also, I&#x27;m sure there are people saying &quot;hey, your work may not be significant enough to cause a Patent violation with Facebook so you and the majority of library users are safe&quot;. Sure, that is likely true. But it&#x27;s about the principle.