&gt; You also can’t go by whether or not it’s open source, because open source apps get abandoned.<p>But if it&#x27;s open source, you can (FSVO &quot;can&quot;, depending on your skillset) fix critical problems yourself.<p>Let&#x27;s say I get Mailborg for $10 and move my mail over to it. Mailborg gets acquired. Dropborg eventually closes Mailborg. Next month, Apple releases OS X 10.12 and something breaks. I&#x27;m SOL.<p>Or I get open-source Thunderborg. Borgzilla stops development of Thunderborg. Next month, Apple releases OS X 10.12, and something breaks.<p>No matter. I&#x27;m still not SOL. Either I have a chance of fixing it, or more likely, someone smarter than me will find a fix and post it, maybe even with a new binary.<p>I&#x27;m no Stallmanite, but this is the whole origin myth of free software, for goodness&#x27; sake.