As of my last knowledge update in January 2022, several websites offer extensive collections of free crochet patterns. Here are some popular platforms where you can find a variety of patterns:

1. **Ravelry:** A comprehensive community and pattern database where you can find a vast collection of free and paid patterns. [Ravelry](https://www.ravelry.com/)

2. **AllFreeCrochet:** This website offers a wide range of free crochet patterns, including accessories, home decor, and clothing. [AllFreeCrochet](https://www.allfreecrochet.com/)

3. **Yarnspirations:** A hub for various yarn brands, Yarnspirations provides free crochet patterns for different skill levels. [Yarnspirations](https://www.yarnspirations.com/)

4. **LoveCrafts:** This platform offers a selection of free crochet patterns in addition to selling yarn and supplies. [LoveCrafts](https://www.lovecrafts.com/)

5. **Moogly:** Tamara Kelly's blog, Moogly, features many free crochet patterns along with helpful tutorials. [Moogly](https://www.mooglyblog.com/)

6. **Lion Brand Yarn:** Lion Brand's website has a section for free crochet patterns, and you can filter by skill level and yarn type. [Lion Brand Yarn](https://www.lionbrand.com/)

Always ensure that you have the right to use and share the patterns you find online. Additionally, be aware that websites and their content can change over time, so it's a good idea to check the latest reviews and user experiences.