Cayley – An open-source graph database

&quot;Not a Google project, but created and maintained by a Googler&quot;<p>Interesting location, being in the main Google organization, given this disclaimer. I&#x27;ve seen other projects with this disclaimer under Googlers&#x27; personal pages before, and I always figured a &#x2F;google&#x2F; URL probably meant it was officially a Google project.

For people that are concerned about lack of development on Cayley it looks like there is a fork that is actively merging PRs if nothing else:<p><a href="https:&#x2F;&#x2F;github.com&#x2F;dennwc&#x2F;cayley" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;dennwc&#x2F;cayley</a><p>Found from the mailing list:<p><a href="https:&#x2F;&#x2F;groups.google.com&#x2F;forum&#x2F;?hl=en#!topic&#x2F;cayley-users&#x2F;DEh24z8pA7M" rel="nofollow">https:&#x2F;&#x2F;groups.google.com&#x2F;forum&#x2F;?hl=en#!topic&#x2F;cayley-users&#x2F;D...</a>

The project has no activity in the last 6 months. I would like to see an open-source graph database that&#x27;s being actively developed and maintained.

What are the main reasons someone would use this over Neo4j? Is being open source the primary differentiator?

Clair the vulnerability database for docker images uses Cayley which is how I found about it, both neat projects and worth a look:<p><a href="https:&#x2F;&#x2F;github.com&#x2F;coreos&#x2F;clair" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;coreos&#x2F;clair</a>

Previously discussed at <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=7946024" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=7946024</a>.

I&#x27;ve been looking at Cayley recently, for a project of ours. We want to ingest millions of Hearthstone replays (simple XML documents describing thousands of key&#x2F;value deltas per game) and analyze the game state for every turn, etc.<p>Cayley seems uniquely suited for that, but its development activity is concerning. If anyone has any other suggestions, I&#x27;m all ears.

I like <a href="https:&#x2F;&#x2F;github.com&#x2F;GraphChi&#x2F;graphchi-cpp" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;GraphChi&#x2F;graphchi-cpp</a> quite a bit. Handles out-of-core graphs really well. Fast.

What exactly is an open source graph?