以下收集的搜索引擎优化工具可以为你有效对网站进行检查，而且他们都是免费的,在大多数情况下你不需要创建一个帐户就可直接使用。（注：这是Charles所见过分类最清晰质量最高的SEO工具列表，总共包括四个部分：关键词工具、链接工具、可用行工具及其他工具，说明备注并非按原文直接翻译，很多工具也只能用于英文站的搜索引擎优化工作中。）
第一部分：关键词工具
关键词研究工具：适当深入地进行关键字研究,为你的网站进行栏目划分及规范关键词部署做准备。
关键词密度：一个关键字、词在页面出现的个数及所占文本的比率。
竞争对手分析:可以分析目标关键词的竞争对手是谁，并分析竞争对手用过的关键词。
搜索引擎关键字位置的工具:利用这些工具来检查你的关键词目前在主要搜索引擎如Google, Yahoo, MSN所处的位置。
第二部分：链接工具
链接广度：跟踪反向链接的总数，并返回哪些网站链回了你及锚文本是哪些。
C级IP地址检查:：对链接伙伴进行IP地址分布检查，而不至于被同一类IP地址的链接所惩罚。
蜘蛛模拟器：可以获知网页外观与搜索引擎蜘蛛索引的区别。
第三部分：可用性工具
浏览器分辨率测试：在不同屏幕分辨率、不同操作系统、不同浏览器下网页的显示效果。
HTML及CSS验证： 毫无疑问,W3C的验证会让你取得更好的搜索引擎排名加分，赶快改正那些错误及不规范的代码吧。
FireFox扩展：更多可参考我之前写过的火狐SEO扩展。
页面速度测试：页面小、下载速度快的网页谁深受用户喜欢。
第四部分：其他SEO工具
PageRank预测：包括未来预测及当前PR值。
流量排名：网站的流量走势及搜索引擎分析。
搜索引擎饱和度：搜索引擎索引网站网页的数量。
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