I'm trying to choose a BI tool, but I don't have a large budget, what would you recommend and why?
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Evaluate Qlik or Tableau. Both of them are relatively inexpensive as compared to PowerBi. However your business and operations team would prefer PowerBI as it relates closely to Excel. From costing perspective, often the developer license would be more than a viewing license. So you need to evaluate how many developers you have vs how many users would like to review these BI dashboards
its open source and free
https://www.knowage-suite.com/site/home/
I endorse Wael Ismail's suggestion. Microsoft Power BI is very Versatile, easy to setup and use and has Powerful Graphics. Over and above that it is relatively less expensive than Tableau, SSA, Business Objects and other well known BI tools. There are also many good not so well know BI Hybrid solutions with On-Cloud and On-Premise offerings.
Tableau!