Babylon has a free version for a long time.
Why still there is no portable version?
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Babylon
YOU MAY NOT:
a. Loan, rent, lease, give, sub-license or otherwise transfer the Product (or any copy) in whole or in part, to any other person, except as noted in paragraph c (Transfer) above.
b. Copy or translate the User Manual, training materials or any other documentation included with the Product.
c. Copy, alter, translate, decompile or reverse engineer the Product, including but not limited to, modify the Product to make it operate on non-compatible hardware or software.
d. Remove, alter or cause not to be displayed, any trademarks, copyright notices or start-up messages contained in the programs and/or documentation.
THIS LICENSE WILL TERMINATE AUTOMATICALLY if you fail to comply with the terms and conditions set forth above.IMPORTANT NOTE: For the removal of doubt, Babylon Ltd may send to Licensees hard disk, from time to time, instructions, such as pings and other commands, which allow Babylon Ltd to terminate the use or operation of the Product. In addition, Babylon Ltd may use cookies during the purchase process and the use of the Product by You.
Babylon Ltd. may also offer you, from time to time, by e-mail or any other means of communication, the services of Babylon Ltd.'s partners.