OK I must be old school I do most of this via command line. but these tools look nice.
Firejail – setup sandboxes, not sure if I would use it as most linux boxes I have are not desktop. But might be useful to testing software.
Gufw – front end for iptables…OK this I am going to look at.
keepass – Used it…
grsync – gui for rsync for backup. OK this is going on my list too. Another one in the article is Deja Dup.