Computers would be pretty useless if you didn't have software on them. I have tried out a lot of different software but these are the ones that I use regularly.
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I spend 90% of my day in Visual Studio Code so it had to be at the top of my list. Heck, even this blog is written in React using GatsbyJs so even my blog posts are written using VS Code.
I used to use full fledged Visual Studio but after moving to a Mac I can't say I miss it. It is great having one editor for all my programming.
I used to buy lots of Moleskine notebooks and later upgraded to the LEUCHTTURM1917. These were great except I ended up having to flick through hundreds of pages to find my scribbled down notes and diagrams.
I now use an iPad Pro for all of my notes and settled on Notability as my app of choice. Not only can you easily group all your notes it has handwriting recognition so I can search through my notes as well. There is also a Mac Desktop app as well so I can have my notes everywhere.
If I find something worth reading I used to bookmark it and then never go back to it.
Pocket has replaced my cluttered bookmarks completely. I now add interesting articles to pocket which then get downloaded onto all my devices. Now when I have a bit of downtime I go on pocket and always have something interesting to read.