Prospero - Professional Business Proposals
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Proposify - A simpler way to deliver winning proposals to clients.
Nicegram - The all-in-one AI-enhanced Telegram client elevating your conversations!
Colibro Proposals - Compose, send, and sign proposals online for free
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.