Chandoo.org: Master Excel for Financial Applications
A highly respected website offering extensive free tutorials, tips, and articles on advanced Excel techniques, charting, data analysis, and VBA, crucial for building robust financial models and dashboards.
More resources on Excel for Finance
Simtools – Free Monte Carlo Simulation Add-in for Excel
Free Monte Carlo simulation and statistical functions Excel add-in created by Nobel laureate Roger Myerson at the University of Chicago Booth School of Business.
A Simple Model – Free LBO Modeling Tutorials
Arguably the best free LBO tutorial series, with unedited walkthroughs and downloadable Excel files. Highly practical for learning LBO modeling from scratch.
OpenBB – Open-Source Financial Data Platform
The most credible open-source Bloomberg alternative, providing financial data and analytics for equities, fixed income, and macroeconomic data.
numpy-financial – Financial Functions for Python
Free Python library covering basic financial functions: NPV, IRR, PMT, and amortization — essential building blocks for financial modeling.
QuantLib – Open-Source Quantitative Finance Library
Industry-grade open-source tools for yield curve modeling, MBS prepayment models, and interest rate derivatives.
AbsBox – Open-Source ABS/MBS Cashflow Modeling Library
Remarkable open-source Python library specifically designed for ABS/MBS cashflow modeling, with human-readable waterfall definitions and sensitivity analysis capabilities.