<p>SATO (Systeme d'analyse des textes par ordinateur) is a longstanding historic text analysis system, now available as a free, web-based tool. Users can either draw off SATO's corpus or upload their own for analysis, and the texts for analysis may be in French, English or Spanish. It can perform standard text analysis functions such as word frequencies, comparisons, tokenizing and keyword in context, and has predefined filters for searches.</p>