A: Hey Isaaq, thanks for asking!

Quotes / estimates:
Not today, but on the way as part of our proposals and contracts work. You'll be able to send a branded quote, get it approved by your client, then convert straight into an invoice. Worth following along here:

https://honeybill.featurebase.app/p/proposals-and-contracts

Customized email:
Yes, you can customize the email subject and body that gets sent with invoices, plus you send from your own Gmail or Outlook so it lands from you, not a no-reply@ tool.

Desktop app for Mac:
A Progressive Web App (PWA) is on the way which lets you install HoneyBill directly to your Mac dock so it behaves like a native app.

Roadmap here:

https://honeybill.featurebase.app/p/progressive-web-app-ios-and-android

Cheers!