XBrowser 

This open-source browser is freeware and is distributed with the most basic functionality as it is. Its main advantages are low system requirements and small file size, as well as compatibility with older OS versions. It is only available in English.

X-Browser! is a free, open source web browser. The browser is ideal for basic browsing, has low system requirements, and is quite small. It is also supportive of older operating systems. Currently avalable in English, it will be translated into Spanish.