Using an icon library in design or development projects offers consistency, efficiency, scalability, accessibility, and cost-effectiveness.25 open-source icon libraries for 2025 curated for design and development projects.Hugeicons offers 4,000+ open source icons with features like easy installation, global CDN, and Figma plugin.Lucide, with 1,555+ icons, emerged as a vibrant, SVG-based library supporting React, Vue, Svelte, and Angular.Phosphor Icons features 6,000+ icons, supporting React, Vue, Svelte, and more, catering to various design needs.Font Awesome, with 2,060 icons, supports major frameworks like React and offers a pro version for extra icons.Bootstrap Icons with over 2,000 icons, specifically designed for Bootstrap integration, offering versatile SVG options.Feather Icons, a minimalist set by Cole Bemis, features over 280 icons for modern UI clarity and ease.Iconoir, with 1,628+ icons, is an open-source library suitable for web, mobile, and desktop apps.Material Symbols by Google provides a comprehensive material design icons system for various platforms.Boxicons, with 1,634+ icons, focuses on versatility and ease of customization, supporting all major frameworks.