I ran across a new IOC harvesting and processing tool on Github. It was posted a couple of weeks ago by an author named Silas Cutler and is licensed as GNU General Public License v3.0
It was recently featured on kitploit.com.
Since it is relatively new I haven’t had time to run it in my lab yet, but based on the description it boasts an impressive collection engine. It can pull from these feeds (likely via API):
If you are looking to feed your SIEM, this might be a cost-effective IOC processing solution.