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Scarlet-Notes
[Discontinued and Unsupported Project] Simple yet powerful rich note taking android application, with a lot of flexibilty of usage
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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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Sapphire-Assistant-Framework
An extensible framework for creating Android Assistants on-device. It does not require Google services or network connectivity
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
For example, I recently tried Aves gallery. It's absolutely amazing and I dont know why it isnt that popular. What other apps like that do you know?
Scarlet / Material Notes
OsmAnd has been my favourite navigation app for years and years now. Offline maps make that I can get by with a very minimal mobile data package and I find it better than Google Maps especially for cycling.
Talking about photo gallery app, if you are hosting your own Nextcloud server, try Les Pas. In addition to basic album management functions and syncing, you can share them with your Nextcloud users and even co-edit the same album with them.
The Sapphire Assistant Framework & the corresponding mobile assistant Athena for Android