ChatGPT & CoPilot are obvious answers, but I'd go further and say the OpenAI discord as well.
There's so many new extensions/tools using ChatGPT coming out it's really been had to keep up & I use the discord server to learn.
Actually, we have developed a Chrome Extension that will increase our productivity for our own needs. Because we were really about to drown in countless CSV dumps!
For this, we have developed a Chrome extension that can synchronize with our own product, and we no longer have to download dozens of CSV files to our computer. We can quickly view and edit all CSV files on the internet without being a member or logging in. This saved me from a big dump. ๐คญ
Check Retable Chrome Extension from the Chrome Web Store, you'll understand what I mean :)
Slack. I have connected all my apps there (ex. github, figma, google calendar etc) so I get pinged whenever something happens there. It's sort of my work dashboard.
Another (hardware) product that has improved my productivity is a second screen that I just got.
Typeform<> Slack integration is powerful for knowing when survey responses come through (great for data analysis), Grammarly for typos (constantly), Canva (speeds up the content creation process), Kahana (keeps notes in one place & allows for team collaboration on hubs), Substack (free way to send unlimited emails & analyze open rate), OnceHub (allowing for customers to book meetings and syncs with my calendar to ensure no overlaps), Figma<> Jira for product management!
Sorry I couldn't just mention one ๐
This might be a clichรฉ answer, but mine has to be Notion. The app has grown from a good writing space to a daily driver for writing, organising and managing space for me. (I have my entire life in my Notion ๐)