Everyone has their own preferences on tools to use, and I'm always interested in hearing opinions of others on what they use. Some of my mainstay tools have come from recommendations.
So I'll list out some tools (and maybe some processes) I use daily, just to show the current tools I'm using and why I like them.
Coding tools:
VS Code: code.visualstudio.com
Pretty much my default Code Editor these days. Have used various over the years, Komodo, jEdit, Visual Studio, Eclipse, Atom, Sublime and more I'm forgetting, but VSCode just seems to hit the sweet spot I'm looking for.
The extensions available are extensive, and the user interface is fast and easy to use. Having folders open up as a Project and being able to navigate around them with ease has made my day to day coding (in Python or CloudFormation, for example) much easier. For CloudFormation for example you can install a linter extension that runs cfn-lint in the background and tells you in real time what isn't right.
Vim
Probably a bit of a throwback sometimes, but I do still enjoy using Vim in certain situations (such as editing a file on a server) and I use a basic set of commands regularly rather than the full set of commands (regexes are few and far between for example).
iTerm2 / Terminal.app
Most of my coding these days is on a mac (though I use windows on my Gaming PC, and I have a soft spot for Linux, especially Mint / Ubuntu / other Debian based flavours). For ages I used Gnome Terminal, and I struggled to find a decent terminal emulator on Windows. (I need to check out Terminal at some point). Terminal access is pretty much essential to me and using a mac gives me the blend of usability I get with Windows and power I get from Linux.
I do still occasionally use the built in terminal with tools such as Homebrew, but have used iTerm2 a lot more recently.
Other Tools:
Chrome (Each to their own).
Slack - Great comms tool with API and Integrations for automation. Video / Audio calls and public / private channels.
Trello - Great To-Do List. Works well just as a general task list, but also as a Kanban Board.
Asana - Great task management tool.
Alfred - Running apps using command + space for me as a shortcut makes things easier. Better than Spotlight.
Divvy - Window Management on Mac. This or something similar is missing from MacOS to make window organisation much easier using the keyboard. Makes going full screen (max window, not a full other screen) and tiling much easier.