1. GoFundMe: As one of the most well-known fundraising sites, GoFundMe is great for individuals, charities, and nonprofit organizations. With no platform fees and easy setup, it is a go-to choice for many fundraisers.

2. Kickstarter: Aimed at creative projects, Kickstarter operates on an all-or-nothing funding model, meaning that if the project does not reach its funding goal, no money is collected.

3. Indiegogo: This flexible crowdfunding platform allows individuals and nonprofits to raise funds for virtually any project or cause. Indiegogo offers both fixed and flexible funding options.

4. Patreon: Geared towards creators such as artists, musicians, and podcasters, Patreon enables fans to pledge a monthly amount in support of their favorite creators.

5. DonorsChoose: Focused on public school teachers, DonorsChoose allows educators to create project requests that supporters can then help fund.

6. GiveForward: Specifically designed for medical and memorial fundraisers, GiveForward offers an easy way for individuals to raise funds during challenging times.

7. Crowdrise (now part of GoFundMe): Catering to nonprofits and charitable causes of all types, this platform offers fundraising tools that are user-friendly and reliable.

8. JustGiving: Emphasizing social sharing tools to boost fundraiser visibility, JustGiving is a popular choice for nonprofits looking to build up their network of donors.

9. Fundly: With a focus on social media integrations and mobile-friendly campaigns, Fundly is great for organizations or individuals looking to spread the word about their causes in a connected world.

10. GlobalGiving: This online-only platform connects nonprofits with donors from around the world. GlobalGiving is known for partnering with established charitable organizations who need a helping hand reaching an international audience.

11. Classy: Built specifically with nonprofits in mind, Classy offers customizable fundraising campaigns, event registration forms, and donor management tools. The platform is best suited for larger organizations.

12. The Giving Block: As the crypto craze continues to grow, The Giving Block allows nonprofits to accept cryptocurrency donations, opening up their fundraising efforts to reach a new audience of supporters.

Each of these platforms offers unique options and features to suit different needs. Consider your target audience, goals, and required functionality when choosing the best fundraising site for your nonprofit or individual campaign.