I can highly recommend the PlantUML plugin for Visual Studio Code [1]. I mainly use this for sequence diagrams and component diagrams. The plugin makes editing and previewing the diagrams awesome. Also checkout PlantUML integration for GitLab [2]. We recently deployed this at work, so not many miles yet, but looks pretty awesome. Main feature is to render embedded PlantUML markup in text files (markdown).

[1] https://marketplace.visualstudio.com/items?itemName=jebbs.pl... [2] https://docs.gitlab.com/ce/administration/integration/plantu...