Lonely Planet online is a website based on the Lonely Planet travel books. This link will bring you directly to the travel information page about Gabon. Here you will find a good deal of travel information to start your exploration of Gabon. The information is organized in the same manner as the books (which you can also order online here). The background info is organized by topic: Weather, Health & Safety, Government, People & Society, Culture & History, Time & Place, Crossing Borders, Money, Events and Transport.
This Wikitravel guide about Gabon is an user generated guide. You can help improve this guide by clicking on the edit button next to a travel topic. Please read the guidelines first before editing the articles. All Wikitravel guides offer information on the following topics: regions, cities, entry requirements, getting out, languages, eating, drinking and sleeping, learning and working in Gabon, health and safety, respect and contact.
WTG provides detailed travel information and articles about Gabon. In the left menu you will find guides sorted by theme and with the menu on the right side provides the table of contents for Gabon: overview, passport and visa, money, health, accommodation, going out, getting around, climate, map and images, travel advice and more. You can also create a miniguide that you can print.
World66 is a nice user generated travel guide made by travelers. Every part of the travel guide can be edited directly by clicking the  button. The guide about Gabon contains information about the following travel topics: general information, map, history, practical info, economy, health, people, books and a photo gallery.