ITAG manager is a good choice for you to view a professional tag field in your website.
1- Get and put data from and to input value.
2- You can add suggestions as a drop down and will be searchable.
3- multi-styles: You can choose between the “default” or the “underbox” style.
4- No one can put the same word twice in our tool.
5- There are more than 3 templates available in the tool.
6- You can make Tags appear with any color you want.
7- All of this can be customized easily by you as you will see in the documentation.
this is the online documentation: