Sensa Emoji - Free, vector, and open-source emoji set
WSTicK - WSTicK – Sticker Maker is a fun app that allows you to create quotes and stunning word stickers using its simple tools.
OpenMoji 12.0 - Open source Unicode-compliant Emojis for everyone
WAStickerApps - Personal Sticker Maker – WAStickerApps is a fun app that allows you to create your own personal stickers to make your conversation more interesting and enjoyable.
EmojiOne for Chrome - Finally, an emoji keyboard for the modern desktop.
Texticker - Create and generate cool personal stickers for WhatsApp Messenger.