I never heard about Fabric. Can't seem to understand what they do from their website. There is no mention of what it does on the home page. Is this some sort of an analytics library?
[1] https://hn.algolia.com/?query=niftich%20fabric&sort=byDate&p...
On a side note, why do people use closed source Crashlytics, when there are open source solutions available (still run by for profit companies, but source of their SDKs are open)?