A free program for Android, by AKX Developers.

Hash – Hashtags for Instagram | Awesome Captions is a great tool for generating hashtags and captions for your photos. It can generate the best hashtags and captions based on the photos you take and post them to Instagram, Facebook, Twitter, and other social networks. You don't need to take any photos or post any messages. Just select the photo you want to post and it will generate the best hashtags and captions for it. The best thing is that it is completely free and doesn't have any ads. You can select the best hashtags from a number of different collections. The more popular a hashtag is, the more likely it is that you will find posts about it on Instagram, Facebook, Twitter, and other social networks. The best thing is that it is very easy to use and it is completely free. You don't need to download any extra applications or plugins to use it. Just install the app and you are good to go.