Chatterino - Chatterino is a chat client for twitch chat.
SmallDevTools - Handy developer tools with a delightful interface
Chatty - Chat with strangers all around the world in Messenger
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Restream Chat - Restream Chat is a versatile software that permits you to streamline multiple chats in one place.
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools