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WordPress
WordPress, Git-ified. This repository is just a mirror of the WordPress subversion repository. Please do not send pull requests. Submit pull requests to https://github.com/WordPress/wordpress-develop and patches to https://core.trac.wordpress.org/ instead.
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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 might recommend WordPress because it's relatively easy to learn and widely supported. WordPress on an old machine, a small virtual private server (VPS), or shared hosting shouldn't cost more than $5/month. You could even use WordPress.com, which is $4/month (billed yearly) and includes a free domain name for the first year (you'd have to renew it in following years, but you could always keep a subdomain)
Try https://tiddlywiki.com/ and make at least two digital copies (one on your computer, one in the cloud) and print out all the new entries every year. or burn them to a dvd. A nice photo printer with archival grade paper would be good to add photos, then you can keep them in an album.