ThinkFree Office by Haansoft ThinkFree Co. Lt., a subsidiary company of Haansoft Corporation, is an office suite written in Java that runs on Windows, Linux, and Macintosh platforms. ThinkFree Office includes a word processor (Write), a spreadsheet (Calc) and a presentation program (Show). ThinkFree Office reads and writes to Microsoft Office file formats (.doc, .xls, and .ppt). ThinkFree Office has a look and feel similar to Microsoft Word, Excel and PowerPoint, allowing users to switch over easily. ThinkFree Online is a web-based version of the office suite.