There are many websites that offer tag suggestions for social media platforms such as YouTube, Facebook, and Instagram. Here are five popular options:

1. Ritetag: Ritetag offers hashtag suggestions for Twitter, Instagram, and other social media platforms. It provides real-time analytics for hashtags and shows you which ones are trending.
2. HashtagsForLikes: This website offers hashtag suggestions for Instagram, Twitter, and TikTok. You can search for hashtags by keyword, and the site also offers analytics to help you choose the most effective tags.
3. All Hashtag: All Hashtag offers hashtag generator and analytics tools for Instagram, Twitter, and other social media platforms. You can generate hashtags based on a specific keyword or input your own list of tags to analyze.
4. TagBlender: TagBlender provides hashtag suggestions for Instagram and Twitter. It also has a feature that allows you to mix and match different tag categories to create a custom set of tags.
5. Ingramer: Ingramer offers hashtag generator and analytics tools for Instagram. It provides hashtag suggestions based on your target audience and helps you track the performance of your tags over time.