I find that the biggest aspect for development is keeping track of information (eg. documentation, tasks, playbooks, etc) Dendron (https://marketplace.visualstudio.com/items?itemName=dendron....) is a note taking tool for developers - its open source, built on plaintext markdown, and integrated with VSCode. You can use it to manage your own personal knowledge base and to document your code base.

Disclaimer: I'm the creator of Dendron. We recently did a Launch HN post where you can find more details on what we're building: https://news.ycombinator.com/item?id=29176158