Started a couple years ago with a simple home network website using Flask to simply save/organize my notes.

It has slowly grown into an entire eco-system that manages/records my entire life, from work to play and everything in between.

• Music player that organizes huge collection of mp3's, scraps the album cover artwork and lyrics, integrated converter (youtube,spotify etc.), playlist to stream/copy to any device, statistics on everything and dozens of other percs/tools/toys custom built.
• Custom news, weather, sunset/sunrise, daylight savings reminders
• Easy on the fly statistical analysis of anything with advanced and simple graphing
• Easy on the fly AI, ML playground
• Reminders, text messages for all upcoming rocket launches (scraped and rss feeds of course)
• Manage my entire home automation setup/status/cams etc.
• Dozens of music related applications for learning/practicing/recording/tracking etc.
• Many, many more applications, just scratching the surface here but everything is automated, I don't want to work it, just enjoy it.

Sometimes I feel a little selfish for keeping all this to myself (my entire household uses it too) but I've been programming and building websites for decades and it's nice to work on something that has no schedules or expectations and the cherry on top for me is zero worry about security or compatibility.