While there is no Clock app on a Mac yet, you can use the Calendar to set an alarm for any time on any day. By adding an Automator script, you can have that alarm play a sound at full volume or speak some text.
When you export photos from the Photos app the date of the file doesn't match the date the photo was taken. This is correct as the file is new and the photo in it does retain the metadata with the original date. But if you want to force the file date to match the photo date, you can do it in the Terminal or with an Automator app.
By using a Shell script in an Automator Folder Action you can create a "drop zone" folder that moves any file placed into it. By using a Shell script it is easy to add new conditions and destination folders.
You can go to the Terminal and use simple one-line shell scripts to get various pieces of information such as the date and time, your Internet IP address and your Wi-Fi network name. Using Automator, you can incorporate these bits of information into a simple notification that appears whenever you press a keyboard shortcut.
Many Mac users wish there was a way to create a new text file in the Finder just like you can in Windows. With the help of a simple Automator service you can add this to your Mac, and even customize how it works.
In Mac Notes you can only export one note at a time as a PDF file. With the help of a script, you can quickly and easily export all of your notes to html files as a backup or archive. You can also save notes this way to clear out your Notes app.
You can use a shell script inside an Automator Quick Action to add the date of a file to the beginning of the file's name. You can also make this work with photos using the date the photo was taken from the metadata in the file. As a Quick Action you can easily apply this name change to one or many files at once.