My two all-time favorites

• Finviz: Perfect for screening and visualizing market trends. Its stock screener lets you filter companies by metrics like P/E ratio, market cap, or dividend yield, while the heatmap view shows sector performance at a glance. It’s fast, free (with a paid upgrade option), and ideal for spotting opportunities or risks before diving into specifics.

• BeyondSPX: Offers high-quality company analysis of over 5,000 U.S. stocks, distilling business models, financial highlights, and market context. It’s ideal for investors wanting a quick starting point to understand companies efficiently. This is hands down one of the best tools I've found. And surprisingly, it's completely free - all 5,000+ reports, even on companies that have zero analyst coverage or institutional following. Super helpful for finding hidden gems.

Premium Tools

• Bloomberg Terminal - The gold standard for comprehensive financial data and analytics.

• Thomson Reuters Eikon - Premium financial data and market analysis.

• FactSet - Integrated platform for financial information and analytics.

• S&P Capital IQ - Extensive research and analytics for value investors.

• Morningstar Direct - Robust investment research and data platform.

• YCharts ($99/month+) - Financial data visualization and analysis tool.

• Gurufocus Premium ($49/year+) - Tailored data and tools specifically for value investors.

• AlphaSense (Custom pricing) - AI-powered market intelligence platform.

• Sentieo (Custom pricing) - Comprehensive financial and corporate research tool.

• Koyfin ($39/month+) - Modern analytics platform with a focus on financial data.

• Motley Fool Stock Advisor ($199; $99 first year) - Offers stock recommendations and research.

• Seeking Alpha Premium ($20/month, annual billing) - In-depth investment research and analysis.

• TIM’S ALERTS ($75/month) - Real-time trading alerts to keep you updated.

• Tradespoon (Up to $200/month) - Predictive analytics for identifying potential trades.

• Trade Ideas ($8.99 for 2 weeks) - AI-driven ideas and strategy suggestions.

• Mindful Trader ($97/month) - Swing trading alerts based on statistical insights.

• Ortex (Custom pricing) - Real-time short interest and securities finance data.

• S3 Partners (Custom pricing) - Advanced financial analytics and data.

• IBISWorld ($900/year+) - In-depth industry market research reports.

• Euromonitor (Custom pricing) - Global market research and strategic insights.

• Frost & Sullivan (Custom pricing) - Market research and analysis in multiple sectors.

• BamSEC (Fee-based) - Organized SEC filings with powerful search capabilities.

• Earnings Cast (Subscription) - Immediate access to earnings call transcripts and alerts.

• Trefis (Subscription) - Interactive financial models for evaluating stock value.

• Estimize (Subscription) - Crowdsourced earnings estimates to complement your research.

Free Tools

• SEC Full-Text Search - Dive into decades of SEC filings via SEC EDGAR.

• PCAOB Auditor Search - Research audit firms and individual auditor histories.

• OpenCorporates - A vast database for company information and registrations.

• ROIC AI - Access historical financial statement data with visualization tools.

• SocialBlade - Track social media metrics for companies and influencers.

• Yahoo Finance - Stock quotes, news, and basic financial data.

• Google Finance - Quick access to stock data and market news.

• Finviz - A popular screener with market visualization features.

• Value Investors Club - Forum for sharing high-conviction investment ideas.

• Corner of Berkshire and Fairfax - Community forum specifically for value investing discussions.

• Reddit: r/stocks - A hub for discussing value strategies and ideas.

• Reddit: r/SecurityAnalysis - In-depth discussion on company fundamentals.

• Twitter (X) - Follow top value investors and market analysts.

• StockTwits - Social network tailored for investor chatter.

• Quora: Investing - Q&A on investing topics and strategies.

• Stack Exchange: Personal Finance & Money - Community-driven Q&A on investing and finance.

• Crunchbase - Database for startup and private company insights.

• Owler - Competitive analysis and company profiles.

• Hoovers - Detailed business information and company data.

• Statista - Market statistics and trend data.

• SEC EDGAR - Direct access to company filings.

• OpenInsider - Insider trading data made accessible.

• WhaleWisdom - Explore hedge fund holdings and 13F filings.

• Insider Monkey - Insider trading news and detailed analysis.

• Finviz Insider Trading - Specialized data on insider transactions.

• Vickers Stock Research - Insights into insider and institutional ownership.

• FINRA Short Interest Reports - Data on short interest for various stocks.

• FRED - Federal Reserve economic data.

• Bureau of Labor Statistics - Employment and economic trends.

• Bureau of Economic Analysis - GDP and economic performance data.

• World Bank Data - Global economic indicators and statistics.

• IMF Data - International financial statistics.

• Trading Economics - Economic indicators and forecasts.

• SEDAR - Canadian company regulatory filings.

• Companies House - UK company information and filings.

• Investor.gov - Educational resources for investors.

• Atom Finance - A research platform for investment analysis.

• Benzinga - Financial news and data service.

• MAXfunds.com - Mutual fund data and analysis.

• Kiplinger - Personal finance tips and investing advice.

• Refinitiv - Extensive financial market data.

• SEC Live - A user-friendly SEC filings reader.

• Rank and Filed - Visualize SEC filing data for trends.

• Dataroma - Follow the portfolios of top investors.

• Finviz Industry Charts - Visual charts by sector for quick insights.

• CFPB Complaint Database - Consumer complaint data that can hint at company issues.

• Glassdoor - Employee reviews and salary data for insights into company culture.

• Blind - Anonymous workplace insights from industry insiders.

• SiteJabber - Consumer reviews for online businesses.

• TrustPilot - Crowd-sourced business ratings.

• BBB - Check business accreditation and consumer feedback.

• Open Payments Data - Data on healthcare provider payments.

• CMS Drug Spending - Medicare drug spending transparency.

• Wayback Machine - Historical snapshots of company websites.

• Google Trends - Analyze search trends and public interest.

• ListenNotes - Search for industry podcasts and transcripts.

• Quartr App - Mobile access to earnings call recordings.

• PlotDigitizer - Extract numerical data from published charts.

• SimilarWeb - Web traffic and analytics insights.

Market Data Resources

• IBorrowDesk - Track real-time stock borrow rates and short sale availability.

• ShortSqueeze - In-depth short interest data and analytics.

• Nasdaq Short Interest - Short interest data for Nasdaq-listed stocks.

• NYSE Short Interest - Short interest data for NYSE stocks.

• Bloomberg News - Stay updated with financial news and market analysis.

• CNBC - Financial news channel with market insights.

Consumer Research

• Yelp - Read consumer reviews for local businesses.

• Google Reviews - User reviews on businesses and services.

• Amazon Reviews - Product reviews that can hint at company performance.

• App Store Reviews - Consumer feedback on mobile apps and tech companies.

Industry-Specific Resources

• FDA Databases - Information on drug approvals, recalls, and regulations.

• ClinicalTrials.gov - Registry of clinical trials for new treatments.

• PubMed - Access to medical research and studies.

• WHO Data - Global health and economic statistics.

• CDC Data - Public health data from the Centers for Disease Control.

• NIH Data - Research data from the National Institutes of Health.

• HealthData.gov - A repository of U.S. government health data.

• IQVIA - Healthcare analytics and data services (with some free data).

Research Enhancement Tools

• VisualPing - Monitor websites for updates that might affect stock value.

• Ahrefs - SEO and website analysis tool.

• SEMrush - Competitive analysis and SEO insights.

Classic Investment Literature

• Charlie Munger's Letters - Must-read insights and partnership letters.

• Warren Buffett's Letters - Annual Berkshire Hathaway shareholder letters.

• Nick Sleep's Letters - Investment correspondence from Nomad Capital.

• François Rochon's Letters - Giverny Capital’s investment insights.

• Michael Burry's Letters - Scion Capital partnership documents.

• Benjamin Graham's Communications - Foundational writings from the father of value investing.

• Bob Wilmers' Letters - M&T Bank annual investor letters.

• The Makings of a Multibagger - Analysis of top-performing stocks.

• Confessions of a Capital Junkie - Insights into automotive industry investing.

• Financial Fraud Throughout History - Yale course materials on financial missteps.

• The Intelligent Investor - Benjamin Graham’s classic book.

• Security Analysis - Definitive guide by Graham and Dodd.

• Common Stocks and Uncommon Profits - Philip Fisher’s influential work.

• Margin of Safety - Seth Klarman’s take on risk-averse investing.

• Poor Charlie's Almanack - A collection of Charlie Munger’s wisdom.

Portfolio Management and Tracking

• Personal Capital - All-in-one financial dashboard.

• Mint - Budgeting and tracking your portfolio performance.

• Yahoo Finance Portfolio Tracker - Monitor your stocks and investments.

• Google Sheets with GOOGLEFINANCE - Build custom portfolio trackers.

• Excel with Stock Data Add-ins - Use Excel for detailed portfolio analysis.

• Portfolio Visualizer - Backtest and analyze portfolio performance.

• Sharesight - Track your portfolio and manage tax reporting.

• Stock Rover - Comprehensive research and portfolio management.

• Simply Wall St - Visual analysis for portfolio tracking.

• Morningstar Portfolio Manager - Monitor and analyze portfolio performance.

Screening and Backtesting Tools

• StockFetcher - Create custom stock screens based on your criteria.

• TradingView - Real-time charting and screening tools.

• Screener.co - Global screener focused on fundamental analysis.

• Portfolio123 - Design strategies and backtest investment ideas.

• QuantConnect - Algorithmic trading platform with backtesting.

• Amibroker - Technical analysis and backtesting software.

• Thinkorswim by TD Ameritrade - Advanced trading platform with backtesting.

• NinjaTrader - Software with sophisticated charting and analysis tools.

• MetaStock - Technical analysis and charting for serious investors.

If you've found any other resources that aren't listed here, feel free to share them in the comments below.