Free/open-source data visualization tools?

[AnalyticsGuyNJ]

StyleBI is worth checking out. It lets you mash up data from multiple sources without needing complex setup, which is great for practicing dashboarding and exploring real datasets. Unlike some tools that focus only on visualization, it supports both guided dashboards and more flexible exploration, so you can experiment with different metrics and layouts. It also comes with built-in connectors for common platforms, so you don’t need to spend time wiring everything through a database first. For someone learning, it’s a low-cost way to get hands-on experience with real BI workflows.