send free sms by apps?

[Saheb]

how to send free sms by windows 8 apps ?

[jomana]

using Viber you can do it, you should use and android app that you allows you to use android apps. and you can use any fake number that you'll use to send messages, and you can even call people who use Viber

[Gizmosupport]

According to me :
"Whatsapp" is best option. It is available for windows also.

[Juanloren]

if you speak spanish, you can use http://www.twinsms.com free sms website