What siem or log analyzer to use?

Hi all,

Can anyone advise me a good (preferable https://mobdro.bio/ https://kodi.bio/) free SIEM tool that can analyze log files and corrolate them? Preferable a user friendly one.

I've tried alienvault, but the open-source version does not keep log files, and I have 250GB log files I need to import to check what happend. (IIS logs, firewall logs etc)