Obsidian is the Winamp of productivity tools. If you're as ancient as I am, you might remember that the best part of that once-ubiquitous music player extension was the massive number of plugins and themes you could install to make it better, all of them built by enthusiasts.Obsidian is a good note-taking application on its own, stuffed with all kinds of features: You can organize notes in folders, link to notes from other notes, and even use advanced options like Mermaid diagrams. But like Winamp, Obsidian truly shines once you dig into its extensive plugin ecosystem. There are over 2,000 Obsidian plugins available as of this writing, and you can use them to basically turn Obsidian into whatever you can dream up.Many of these plugins are small in scope, granted, but not all of them. Some of the extensions are extensive enough to replace entire applications you might otherwise be using. Here's how I used Obsidian plugins to replace four different productivity tools.Your kanban app My real kanban board is full of secrets so enjoy this fake one. Credit: Justin Pot I used to be a big fan of Trello, once a humble personal kanban planner. Fifteen years of bloat and upselling mean that application is unrecognizable today, which I'm fine with, because Obsidian works better for me than Trello ever did. I owe it all to the Obsidian Kanban plugin.Install it, and you can create as many Kanban boards in Obsidian as you like. Every card can include as much text as you want, formatted the same way you would anything else in Obsidian. That includes linksevery card can link to the pages you're using to manage your projects.I'm a freelance journalist who writes for a handful of publications, including the one you're reading now. I typically write around 20 articles a month, meaning I always have multiple projects on the go. I use an Obsidian Kanban board to keep track of everything. I have columns for "Plan to write this month," "Plan to write this week," "Outlined," "Submitted need edits," "Edited not invoiced," "Invoiced not paid," and, finally, "Paid." This system allows me to see everything I'm working one in one place, and track my progress on all of them. I honestly don't know if I could manage my workflow without it. And, because I also do all of my writing directly in Obsidian, I can jump straight to a project from my dashboard.This is just one exampleI'm sure you can think of other uses. But perhaps my favorite part of this system is that every kanban board in Obsidian is, in reality, just a markdown document that combines a few lists, meaning I can export them and keep an archive, even if I stop using Obsidian.Your journaling app Credit: Khamosh Pathak Lifehacker has written a lot about journalling apps over the years, and I personally have extensively tested every example you can think of, multiple times. All of them have pros and cons, and I'm not going to pretend that Obsidian is the best tool for everyone. What I will say is that I use Obsidian for my personal journal, and I can't imagine using anything else.My colleague Kamosh has already written about using Obsidian as a journalling app, so I'll refer you to him for more on how to get started. But I'll add that I recommend installing the journal review plugin so that you can regularly look back at previous entries. You can also look into Obsidian's templates feature if you want to use the same outline for your journal every day. I used it to create something similar to a bullet-journal, with questions about my day.Your read-it-later app Credit: Justin Pot A few months ago, Obsidian launched Obsidian Clipper, which saves webpages to your personal "vault." This is an extension for every major browser that allows you to save entire articles from the web. This is useful for research, but it also means you can use Obsidian as a replacement for read-it-later applications like Pocket or Instapaper. Just set up a dedicated vault for articles you want to read later, point the plugin toward that vault, and open your read-it-later vault every time you want to catch up on your backlog. You can even do things like highlight or add your own notes while you read, all without having to pay for a subscription.Your to-do app Credit: Obsidian Tasks The problem with many to-do appsand the reason Lifehacker will seemingly never stop writing about themis that everyone has different productivity needs and no single app can serve them all. If you have never found a to-do system that's perfect for you, that's understandable.But if that's you, and you're a fan of Obsidian generally, look into the tasks plugin. This tool goes through every single note in your vault and collects all of the markdown task lists you've created. It's a perfect add-on if you already use Obsidian to outline your projects. The extension also allows you to add due dates, including recurring tasks, and set your priorities.