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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 use Electrum (BTC version, LTC version) as my off-exchange, storage wallet on my Mac. There are Windows and Android versions as well. There are also plenty of iOS and android apps that offer crypto wallets if you prefer to keep such a thing on your phone. I like Electrum because it assigns addresses without requesting any info from you or forcing you to 'create an account.'
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.