[Blind-sysadmins] Accessible TOTP tools

Several Web sites that I use offer Time-Based One-Time Passwords (TOTP - RFC 6238) as the second factor in a two-factor authentication scheme. To manage TOTP and to create the six-digit time-based codes that need to be entered during the authentication process, I'm using oathtool under Linux, which is excellent: it's a command line tool, and one can easily write a shell script to generate the codes. I've tried FreeTOTP under iOS, but it isn't very accessible. What other tools (for various operating systems) have you found useful for this purpose?