Chrome: Although Gmail can already send and receive text messages, it doesn't sync with your Android smartphone. Gtext, an extension from previously mentioned MightyText, sends and receives texts directly in Gmail using your mobile phone number.
Since DeskSMS might not be taking new users, this is a great alternative just in time.
Just like MightyText -- rightfully billed as the iMessage of Android -- every SMS (and MMS) you send from Gmail syncs up with your smartphone (presuming you have the Android app installed too).
The interface works just like chat in Gmail, only you're actually sending text messages. You also get a handy "Compose SMS" button right beneath the standard email compose button you're used to. If you already have MightyText installed, you'll get up and running in about 10 seconds. If not, installing the app won't take much longer.
For those of you who spend a lot of time in Gmail and hate switching to your phone to text, this Chrome extension is a must-install.
Gtext (free) [Chrome Web Store]