This telegram bot allows you to search your favorite stickers and discover new ones via inline query (just like @gif).
The inline query filters by looking at custom tags, detected text, emojis, sticker set name and title. There already are about 4100 searchable sticker sets with over 230k stickers. And in case the bot is missing some, you can easily add your own precious sets.
Sticker finder is quite fast (about 0.1 sec for each search), supports custom tagging and features fuzzy searching! There are several ways to conveniently tag stickers: You can tag either in a direct telegram conversation or on the fly in any other chat.
I even perform basic text recognition on all stickers to allow a nice sticker search by text (even though this doesn't work perfectly all the time).