TxtDrop is a web-app that allows you to send text messages to anyone’s cell phone (it also supports international users; however, it is not an iPhone web-app). I was initially concerned about privacy, but after reading their Private Policy (and viewing other trust-website-lookups), it look safe. If you are worried about getting spammed you can add your phone number to their block call list. I thought this was a nice as I have never found a “truly” free text messaging as some of the apps that do this still cost to purchase them [Free- Web link]

TxtDrop webapp