Text from Computer

There is TextNow for windows 8.1, had an account ever since it is/was on iOS and android; it is also available for windows phone so you can get texts from both your windows phone and the computer.
 
There are a number of different Application to Person (A2P) platforms online. A search for 'Bulk SMS' will show this. The decision you'll have to make is whether you want the one with the cheapest cost per SMS, with few features and less reliability. Or to pay a little more per SMS for smart features and higher successful send rates
 

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