The page title is very important for both SE (relevant keywords) and clients, because the title of the page catch clients eyes in search engines (it is bolded, it is colored...)

By default, Opencart sets the name of the product/category/info as the title of product/category/info page.

With this extension you can set custom title for products, categories and info pages.

For example, if you have the product named iMac - the default web page's title is iMac. But with this extension you can set a custom title page: iMac - Sales 30%OFF, leaving the name of the product intact.

Multi-language support - You can set a custom title for each language.

Demo:
http://ocdemos.womgoo.com/admin
user: demo
pass: demo

This extension is included in Opencart SEO PACK. It contains 11+ extensions and you can save more than $40 by purchasing the full Opencart SEO PACK:

http://www.opencart.com/index.php?route=extension/extension/info&extension_id=4653

Easy VQMOD install. No files or data will be overridden.

UPDATE v1.1:
Custom Titles were added for info pages.

*** This extension is not compatible with OC 2.x. The version for OC 2.x and OC 3.x is included in Opencart SEO Pack PRO which also includes all the other SEO related extensions and features.