There are undoubtedly numerous item analysis programs available these days: search the internet -- there will be thousands of "hits". Of them, Lertap and Iteman are unique in that they have pedigrees dating back to the 1970s. They're probably among the most popular and feature-rich item analysis programs in use today.
Lertap 5 and Iteman 4 are similar in that they output similar statistics and, to some extent, similar graphs. But they differ greatly in both the format and the quantity of their output. Lertap 5 is "gestalt oriented"; it presents output in a relatively concise, colorful manner organized in what may be called "themes". In contrast, Iteman 4's output is organized by items, and is without doubt comparatively verbose.
As an example, Lertap 5 will collect item-response plots and present them as a group (in this example, the 'theme' is "packed plots"):
Iteman 4, in contrast, presents similar plots on a one-by-one basis, one page for each test item. Examples of Iteman4 output may be seen here.
More comments on Lertap 5 and Iteman 4 may be found in this document. Mention of other item analysis programs is made in this topic, and also in this one, a special for students and instructors.