Things that we pay for.<p><i>SQL Server</i>: it's not cheap, but it's genuinely good. Live query plans, clustered columnstore indices, linked servers, rich SQL features.<p><i>Tableau</i>: more than a dashboarding tool, it's actually a really good multivariate exploratory data analysis (EDA) tool. You can use it to visualize multidimensional data easily. I do use Jupyter (seaborn, plotly) and R (ggplot2) which are good, but Tableau lets you touch your data and move stuff around in a more fluid fashion. The UI lets you really interact deeply with your data. I find that on a new dataset, I can get usable results out of Tableau faster than if were to muck around with ggplot2's syntax, even though I'm familiar with the latter. There is a learning curve for Tableau though, especially around how to structure your data for visualization (you have to think in SQL-like operations). It's not just dragging-and-dropping -- a certain mindset is required.<p><i>Active Directory</i>: it's just there. It's pretty decent.<p><i>Visual Studio</i>: I don't use this every day, but I do maintain a complex C# codebase from time to time (among other things), and Visual Studio (not VS Code! though I like VS Code too) is genuinely a pleasant IDE. I'm a big fan of the C# language and the integration with dev tooling is unparalleled e.g. solid refactoring, peeks, referencing, Intellisense, etc. The IDE supplies a ton of guards to help avoid human errors.<p><i>Splunk</i>: it's good. Not the cheapest though.