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memos
An open source, lightweight note-taking service. Easily capture and share your great thoughts.
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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.
I'm using Memos, https://github.com/usememos/memos
Bonus there is an application (on F-Droid/PlayStore for Android and AppStore for iOS) : https://memos.moe/
Linkace is a good option.
I've got Tasks installed on my Nextcloud instance https://github.com/nextcloud/tasks and then just use the OpenTasks app on Android to note things down and read them on the go. https://opentasks.app
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.