Oanda also offers tick data for free provide you have an account with them and maintain a balance in excess of $1,000 (academic exceptions are possible). The data can be downloaded from
https://fxtrade.oanda.com/trade-forex/fxtrade/historical-data
It appears that you need to log in to see the relevant restrictions but I have included them here for people to see
To qualify for this service, you need an fxTrade account with a balance of USD 1000 or more. (See below for additional restrictions, and to find out about academic exemptions.)
Restrictions
To qualify for this service, you need an fxTrade account with a balance of USD 1000 or more. (There is an exemption for academics—see below.)
You can order data dated as far back as January 1, 2004, and as recent as two (2) months ago. Dates begin and end at midnight GMT.
Orders may take up to two weeks to process.
So that we can fairly accommodate as many people as possible, each user account can have only one order queued for processing at any time. You may submit a new order as soon as your previous order is processed.
This service requires a Javascript-enabled browser.
OANDA Rates® are proprietary. Access and use is subject to a limited purpose, fixed-term license agreement. Use is restricted to Licensee's own internal use. Rates are provided "as is" without warranty of accuracy or completeness. All rights reserved.
Academic Exemptions
If you are an academic, you can apply for an exemption from the USD 1000 account minimum:
You still must open an fxTrade account.
Click the exemption box located at the bottom of the form.
In the form's description box, supply details of your academic institution and faculty and include an email address from your academic institution.
TrueFX also has good history with a variety of pairs. Registration is required but is free.
TrueFX brings you real, dealable prices from market making banks, delivered directly with no intermediary. With TrueFX, everyone with an Internet connection has access to clean, untouched liquidity, direct from leading market makers. TrueFX offers streaming real-time, tick-by-tick bid/offer currency rates for free. It also provides access to a database of historical tick-by-tick bid/offer currency rates without charge.