Aqui podes encontrar alguns dos sites mais usados durante o desenvolvimento web
1. Bootstrap:
https://getbootstrap.com/
2. Swal Fire:
https://sweetalert2.github.io/
3. AOS:
https://michalsnik.github.io/aos/
4. GSAP:
https://gsap.com/
4. Fontawesome:
https://fontawesome.com/icons
4. Color Hunt:
https://colorhunt.co/