A: Hey Yohan

Three great q's here...

#1 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

#2 Customised email:
Yes, you can customise 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.

#3 Desktop app for Mac:
YEP! We just deployed our Progressive Web App (PWA) which lets you install HoneyBill directly to your Mac dock so it behaves like a native app. You can see more details here:

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

Cheers!