Desktop Notifications
Desktop Notifications forwards supported vanilla Minecraft client toasts to your operating system while leaving every original in-game toast unchanged. It handles advancements, newly unlocked recipes, tutorial hints, and Minecraft system toasts.
Use Applied Energistics 2? Install AE2 Desktop Notifications for AE2 crafting-completion alerts:
https://www.curseforge.com/minecraft/mc-mods/ae2-desktop-notifications
The two mods are completely independent and may be installed separately or together.
Why use it?
Minecraft toasts are easy to miss when the game is minimized, covered by another application, or running on a second monitor. This mod lets you keep working, browsing, or chatting outside Minecraft without losing useful vanilla notifications.
Source: https://github.com/cTux/mc-desktop-notifications
Issues: https://github.com/cTux/mc-desktop-notifications/issues