Take Office password unlocker 3.0 for example, it offers three attack modes according to different cases. Including brute-force attack, brute-force with mask attack, and dictionary attack.
Brute-force Attack: The program will try all possible character combinations randomly. If you can't remember anything about the password, like its length, possible characters it contains, frequently used character set for your password. Then use this attack, however, this attack may consume relatively longer time than that when using the other two types.
Brute-force with Mask Attack: You can use this attack if you still remember part of your password. For example, if you still remember your password is 4 characters and begins with "z", then you can define the mask as "z???". This reduces the work for the program, as it will seek for the last 3 characters of the password instead of 4 characters of the whole. To use this attack, a Password Mask is must defined.
Dictionary Attack: This attack is highly recommended. If use properly, it is the fastest when compared with the above two attacks. This attack is intended to seek the possible password based on a dictionary. This dictionary can be the integrated one or the one you provide. The integrated dictionary is a text file listing common character combinations, such as a, ab, 123, 4, AB, etc. that people may frequently use for passwords. You can also create a dictionary by listing your character sets that you frequently use to let the program base on when seeking passwords. If so, the seeking scope is largely reduced and it is bound to save time for the process.
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Another isExcel Password Unlocker, like Word Password Unlocker, It is specially to recover ms excel spreadsheet passwords.
http://www.passwordunlocker.com/products/opu.html
and you can download it at
http://www.passwordunlocker.com/downloads/office_password_unlocker_trial.exe