MTR is basically a combination of traceroute and ping - I've used it
frequently to diagnose routing issues between hosts, and it's come in
handy multiple times.
Added Sheepdog, which is a already mature distributed block storage, S3 Storage and distributed file systems. Created by the japanese NTT and licenced as GPL2.
Project is retired and shouldn't be used, per their website:
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The Obnam project is retired. See https://blog.liw.fi/posts/2017/08/13/retiring_obnam/ for more information. Please use another backup solution instead.
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PHP Server Monitor is a nice and (well maintained) self hosting monitoring solution.
(If there shold be a link to the code, here it is: https://github.com/phpservermon/phpservermon)
FreeIPA is not a tool to manage LDAP directories, but rather it's own LDAP directory (389) with Kerberos and named built in. Similar to Active Directory for *nix.
PGObserver (https://github.com/zalando/PGObserver) is an open-source monitoring solution for PostgreSQL databases. It covers almost all the metrics provided by the database engine's internal statistics collector, and works out of the box with all PostgreSQL versions (beginning with 9.0) as well as AWS RDS.
Let me know if you have any questions. :)
morkot