Unlimited Email Tracker - Track opens and clicks, set reminders and delays in Gmail

Birdly - Birdly is an expense management and expense report solution for SMBs.

Mailtrack.io - The best email tracking solution I've found. Free

Hermition - Manage your day to day routine accounting tasks with the help of AI and get paid online quickly for your work done.

EmailTrackerPro - EmailTrackerPro is an email tracking and spam filter solution.

Railz - Build Financial SME apps using normalized Accounting data