OpenOffice.org is a multiplatform and multilingual office suite and an open-source project. Compatible with all other major office suites, the product is free to download, use, and distribute. OpenOffice.org is sponsored by Sun Microsystems, which is the primary contributor of code to the Project. Over 180,000 people from every nearly every curve of the globe have joined this Project with the idea of creating the best possible office suite that all can use. They do so under the auspices of "open source."

OpenOffice原是Sun公司的一套商業級Office軟件－StarOffice，經過Sun公司公開程序碼之后，正式命名為OpenOffice發展計劃，并由許許多多熱心于自由軟件的人士共同來維持。讓大家能在MS OFFICE之外，還能有免費的Office可以使用。OpenOffice是個整合性的軟件，里面包含了許許多多的工具，其功能絕對不比微軟的MS Office還差，不但可以有Word一樣的字處理，制作簡單的圖形，更有功能強大的圖表功能，也能編寫網頁，還可以做出MS Office中很難處理的數學符號等等，支持了XML、微軟的doc、Excel、ppt文件等格式。

Download: OpenOffice.org 2.2.1 (Windows)
Download: OpenOffice.org 2.2.1 (Linux)