Its a very diverse question, because it depends upon the domain where productivity is required.
For example: If you are an active Linkedin user and trying to grow your personal Linkedin brand.
A great productivity tool would be ConnectGenie AI ( https://www.connectgenie.ai/ )
It helps you effortlessly build you Linkedin Personal brand, by helping you.
- Draft Captivating Linkedin Posts, with engaging Hooks.
- Spark meaningful conversation on Linkedin, by helping you write comments according to your style.
- Grow your network in a more personalised manner by writing for you Linkined Connection Request Notes based on your prospect's Linkedin profile or their most recent Linkedin post.
- Discover leads on the go based on Keywords with their Highlight post feature.
- Write Customised Job Cover Letters based on your Linkedin profile or you can also upload your resume.
For me, it is this app that actually am releasing this Friday, which is the one actually helped to build our last product in record time. All of the tools listed here also makes sense
If productivity is your main aim, ChatGPT is a great tool that can help with all sorts of tasks - writing posts, articles, code, marketing copy, you name it. I've been using it a lot lately and it's really boosted my output. Worth checking out if you haven't already!