<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>omneity</author><text>I used crossbar at multiple occasions in projects of various complexity. My main take away:&lt;p&gt;- Pleasant to use and does almost exactly what it advertises&lt;p&gt;- Interesting authentication &amp;amp; permission patterns, unfortunately we couldn&amp;#x27;t extend it to the frontend, and that left us with a strange gap&lt;p&gt;- Hard to scale for serious cases, clustering is impossible in the open source edition and the commercial version costs in the 5 figures &lt;i&gt;per cluster node&lt;/i&gt;&lt;p&gt;Ultimately I am quite confused about the target demographic of Crossbar (factories moving to IoT?)&lt;p&gt;I don&amp;#x27;t know of many pubsub + rpc solutions targeting a similar tradeoff with a tight packaging and a similar learning curve. Here are some I found then:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;deepstream.io&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;deepstream.io&lt;/a&gt; is the closest and has a richer feature set (including a replicating document store), however it seems to have a small ecosystem &amp;#x2F; community &amp;#x2F; limited support options, and permissions do not seem as advanced.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;nats.io&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;nats.io&lt;/a&gt; is close but lower level. Has a large community and rich ecosystem however.&lt;p&gt;Then you can also mix and match lower level technologies to achieve the particular set of tradeoffs you need. MQTT, AMQP, WS as the protocol, mosquitto &amp;#x2F; rabbitmq &amp;#x2F; zeromq, then json-rpc on top, grpc ...</text><parent_chain></parent_chain></comment><story><title>Crossbar.io – an open source platform for distributed and microservice apps</title><url>https://crossbar.io/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>kitd</author><text>Maybe I&amp;#x27;m just getting old, but can someone explain what this is? Some kind of message broker? &amp;quot;Networking platform&amp;quot; is too vague.</text><parent_chain></parent_chain></comment><story><title>Crossbar.io – an open source platform for distributed and microservice apps</title><url>https://crossbar.io/</url></story>