InfoClick is a uniquely powerful email search tool designed to guide you to the emails you've been trying to find. InfoClick enhances Apple Mail on macOS.
CHANGES in VERSION 1.2.8:
• Restored native support for Apple Silicon (M1).
• Fixed: possible crash when indexing malformed emails at higher indexing speeds.
• Changed: higher indexing speeds should use additional background resources.
• Fixed: skipping draft emails should update the progress bar.
• Fixed: don't let users close the progress window.
• Fixed: email counts in the progress window should be formatted using thousands separator.
Nisus Writer Pro 3 
Nisus Writer Pro 
Nisus Writer Express 4 