Open Source Apps Solution

Backup
Duplicati
https://www.duplicati.com/download

FreeNAS
https://download.freenas.org/11.3/STABLE/U2.1/x64/FreeNAS-11.3-U2.1.iso

Xigmanas(FreeBSD base), some problem at LSI RAID 10
https://sourceforge.net/projects/xigmanas/
https://sourceforge.net/projects/xigmanas/files/XigmaNAS-12.1.0.4/

OpenMediaVault(Debian base)
https://www.openmediavault.org/download.html
https://sourceforge.net/projects/openmediavault/files/

Amahi (Fedora base mediastation)
http://www.amahi.org/

Email and Documentation
Zimbra
https://www.zimbra.com/downloads/
https://www.zimbra.com/downloads/zimbra-collaboration-open-source/

for ubuntu 18
https://files.zimbra.com/downloads/8.8.15_GA/zcs-8.8.15_GA_3869.UBUNTU18_64.20190918004220.tgz
for RHEL 7
https://files.zimbra.com/downloads/8.8.15_GA/zcs-8.8.15_GA_3869.RHEL7_64.20190918004220.tgz
for RHEL 6
https://files.zimbra.com/downloads/8.8.15_GA/zcs-8.8.15_GA_3869.RHEL6_64.20190918004220.tgz

Net Meeting
Jitsi
https://desktop.jitsi.org/Main/Download

https://meet.jit.si/
System Configuration
Proxmox
https://www.proxmox.com/en/downloads


reference
https://www.jason.tools/open-source-solutions

http://blog.ilc.edu.tw/blog/index.php?op=printView&articleId=648179&blogId=25793