Can Texis search data in languages other than English? Does it handle the "accented" characters of Spanish or French etc.?

Yes, Texis is used in many languages. It probably will work automatically for most European languages. Support for UTF-8 (Unicode) is standard. For other encodings, some configuration settings may be necessary. Accent characters and any other non-English characters will be preserved in the data and become fully searchable, if desired. There are settings to control how searches respond to case, diacritical marks (accents etc.), ligatures, character width etc. For example, searches may be configured to ignore accents, so that users unable to enter accented characters may still find accented-character data, and vice-versa.