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cartridge
Cartridge is a convenient self-hosted game collection library with easy file downloads and automatically imported metadata and images. (by jamjnsn)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Kimai 2
Discontinued Kimai is a web-based multi-user time-tracking application. Works great for everyone: freelancers, companies, organizations - everyone can track their times, generate reports, create invoices and do so much more. SaaS version available at https://www.kimai.cloud [Moved to: https://github.com/kimai/kimai]
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Pi.Alert
WIFI / LAN intruder detector. Check the devices connected and alert you with unknown devices. It also warns of the disconnection of "always connected" devices
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Statping
Status Page for monitoring your websites and applications with beautiful graphs, analytics, and plugins. Run on any type of environment.
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zotero
Zotero is a free, easy-to-use tool to help you collect, organize, annotate, cite, and share your research sources.
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xournalpp
Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input from devices such as Wacom Tablets.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Something like Monica?
I have Kimai does this really well. We use it at work and it is great for tracking how much time is logged against a project, doing certain tasks. All sorts of stuff.
Native Android TiddlyWiki app or take over/enhance some project, e.g. created a docker image for this, but the actual app could use some love: https://github.com/pucherot/Pi.Alert There are some good suggestions.
Have you tried Hammond? https://github.com/akhilrex/hammond
If you don't mind working on something that already exists, I'd suggest helping out on Dim.
Open Project?
Why does Calibre not work for you?
Been working on fully plugin based dashboard for some time. But its pretty WIP right now. https://github.com/dgalli1/YetAnotherDashboard
You could probably get Zotero to function like that using tags.
If you don't mind the lack of multi-user support, then i think Xournal++ might be what you're looking for!
How? Encapsulating the "core" part in an HTTP API. For example I don't write C++ and I don't even know much about swarm robotics. Yet to help a group of researchers I wrote a short NodeJS server for Argos3 https://github.com/ilpincy/argos3 that allowed few functions, in particular starting a simulation and get the results back. I did so naively at first and then in order to get faster feedback tinkered with server-sent events. This allowed me to connect an interface like ObservableHQ in JavaScript or Jupyter Notebooks in Python (but can also be JS, Julia, etc) by providing that API and results via HTTPS.