Suggest an opensource Syslog server

Question

Hi, 
 
 Could anyone suggest an opensource (completely free) syslog server to be used with XGS2100 and XG86. We have couple of XGS2100 and 14 XG86. This server should also store syslogs from some other devices like NVR, routers and windows 2019 servers. 
 Please calculate the data size considering the abouve device numbers and advise accordingly. 
 If the free version doesn't satisfy my need then suggest any one time paid version. 
 
 Thanks in advance

Mayur Makvana · Answer

Hello Manoj na , 
 Thank you for reaching to the Sophos Community! 
 We have tool which is designed to calculate the disk usage required based on the model, you may use this as reference. 
 https://www.sophos.com/en-us/products/next-gen-firewall/central-reporting/sizing-tool 
 You may use the below KBA to integrate the external syslog server: 
 https://docs.sophos.com/nsg/sophos-firewall/20.0/Help/en-us/webhelp/onlinehelp/AdministratorHelp/SystemServices/LogSettings/SyslogServerAdd/index.html 
 You may use any standard syslog server and you may have to check by yourself about the syslog server selection.