Libre Office

Some people may have heard of this Microsoft Office competitor, especially if you've got any LInux experience under your belt. I believe this was formerly called Open Office, or it branched or something, but needless to say, the software is completely free, and is kept up to date. I use it instead of Microsoft Word and Excel, because it's fully compatible with MS stuff... and because I'm a cheap bas..... person-- I mentioned it's free! It's got a ton of functionality built in and so far I haven't had any need to install anything custom for it. Although, it does take a bit of getting used to, it's powerful enough for everything I do. There's also an Android app, I think, but I haven't really had a reason to use it, as I prefer to use Obsidian on my phone for my writing projects.