It took me multiple rounds of trial and error to settle on a list of tools that I use as my second brain.
These tools are all free, but unfortunately they’re not all open-source. I generally prefer open-source tools as you don't have to risk getting locked into a vendor which later on might charge for the service or remove features that you rely on.
The following tools are still useful although not all are open-source.
My second-brain tools
Markfolder https://markfolder.com/
This is a tool for bookmarking tweets and organizing them in folders. It is a handy tool with extensions for multiple browsers that allows you to organize your bookmarked tweets without subscribing to Twitter Blue.
Pocket https://getpocket.com/
Pockets lets you save articles on the web to read later.
Hypothesis https://web.hypothes.is/
Hypothesis is a free and open-source tool for annotating the web. Pocket also offers a web annotation feature but only to premium users. Hypothesis fills that void.
Google Play Books https://play.google.com/store/books
I use this for reading and annotating books. The highlights and notes for each book are saved in your Google Drive which you can later review on any device.
Momento https://app.momento.fm/
This is a smartphone app for annotating podcasts and saving your favourite moments in a podcast.
Daily idea dump sessions
At the end of the day I sit down for an hour for my daily idea dump session.
In this sessions I would go through the content I have saved that day using the tools in my toolbox. I then capture the ideas that resonate with me and use them as a starting point for creating my own content.
I hope this was useful and happy creating.