This repo is a lose collection of Salesforce stuff I find useful enough to keep.
Likely it will mostly contain anonymous Apex scripts, but let's see where this is going.
I have an other Salesforce related repo for the command line stuff

The purpose of my on-/off switch scripts was a full sandbox replacement project.
We basically loaded production org backup into a partial sandbox via multiple etl jobs.
The last things you need in such a situation are data validations and sorts of triggers.
My scripts step 1&2 are deactivating most of that stuff and keep note of what was active.
When you're done with the load, execute step 3 to easily switch back on all elements.
The below shown method works with validation rules, process builder and workflow rules.
Apex triggers wont work unfortunately as they can't be updated by the tooling api.

Method:

• STEP1: Query vr, pb or wfr via tooling api -> store their meta data in cases.
  
• STEP2: Loop through those cases, switch active elements off via tooling api.
  
• STEP3: Loop again through those cases, switch prior activated elements back on via tooling api.
  

Start and End of each step are marked within the scripts.
Execute them one-by-one when they are needed.

// START STEP 1 -> "QUERY FLOW DEFINITIONS, STORE FD DATA"
// END STEP 1

NOTE: You could run into troubles if you've active trigger, routing or validation logic set on the case object.
If you have a lot of rules in your org you might hit api call limits.
I believe if you have more than 100 elements (total, active + inactive) some script refactoring would be required.

Direct links to ON/OFF switch for element:
Process Builder
Validation Rules
Workflow Rules

PermissionSetAssignment assignes Permission Sets from one user to an other.
Just place source and target user IDs in the script and execute anonymous.

String sourceUserId = ''; // <-- Place Id of user WITH permissions here (active or inactive user)
String targetUserId = ''; // <-- Place Id of user WITHOUT permissions here (only active user)

The script queries all permission set assignments of the source user … and adds those which are missing to the source user.
It is currently written to take only one source and one target user. This could easily be upgraded.

This sends you an email with api names & labels of all objects in your org. Replace the email address variable in the script with your recipients:

String emailRecipients = '[email protected]'; // <-- PLACE RECIPIENT(S) HERE

The script comes with a plain text and a html version.
I have used the html version as a quick way to get that data in a table format.
Just copy the mail body into a text editor >> save as .html file >> open in browser

From there, copy it into Excel or wherever you need it.

Had to find all email alerts which where sending mails to a certain public group.
Wrote this anonymous apex script to find a recipent with help of the tooling api.