While Gitea works well (which I use daily), with many people involved, perhaps use something with gantt chart, so people can track the schedule of each tasks visually?
I have not used this but there seems to be one for GitLab (and GitHub) called GanttLab.
For alerting, Prometheus can do that but I’ve been using monit for 10+ years and it’s working great with easy to understand DSL with minimum fuss. (
Sample configurations.)
If you want to have a unified web interface of monit deployed servers, m/monit is a nice addition. (This is a self hosted software but it’s a one time payment software.)
(I’m not affiliated with any of the software mentioned.)
For issue tracking, mantis is pretty old and probably not the right choice when people are more accustomed to the GitHub style which Gitea and GitLab supports.
wiki.js is feature rich and is a solid solution (You can see sample from their official doc. You can also do tables easily but I’ve seen some layout corruption on mobile phones on some occasions.
I know this is not a popular opinion but WordPress can be a decent wiki platform too and so far it worked well when I used it as a wiki without major problems including on mobiles. Maybe something to consider.
And I would totally avoid restic for backup. While the tool seems popular and command line interface looks slick, it chokes when the data gets big and consumes memory and the issue gets closed without being fixed. Also restore takes very long on large data sets. I’ve looked at plenty of open source backup CLI tools and duplicacy is another decent one but this also consumes high memory at this point and I wouldn’t recommend it and it’s also slightly costly with per server subscription.
On the other hand, borg is quite stable and performant and is the recommended tool for encrypted/deduplicated backup but this tool only allows targets against SSH servers, so no easy way to target S3 (and compatibles) but there are services like rsync.net (with borg discount) with a track record of 20 years which provides just that. There’s also borgbase but is a young service.
(Again, not affiliated with any of the services mentioned.)
Also what to do with file sharing?
NextCloud is ok but definitely not as polished as other online storage drive services and I wouldn’t touch most of the plugins as they’re not professionally complete.
If there is a need for shared calendars using calDAV, I actually recommend NextCloud as it’s easy to set up that can link up with keycloak than standalone servers like Radicale which works well for macOS, iOS and Android. (Not sure of a Windows calDAV client but AgenDAV is a modern looking decent web interface.)
For a smaller stuff, “healthchecks” can be self hosted to watch for cron jobs success to keep a peace of mind than having cron jobs pile up error logs without people noticing.
(Was going to add links but couldn’t due to Discourse limitation on new users.)