RCDevs solutions use mobile phone as the authentication device (user token). Mobile phones are the best choice for end user token devices as it means:

• Easy human interaction
• No dedicated tokens hardware
• No need to renew/upgrade tokens
• No costs from lost/stolen/broken tokens
• Never obsoletes
• No delivery delays
• Leverage in security (strong 2-Factor authentication via 2 different data channels)

This is a list of FREE Software Tokens compatible with OpenOTP from various publishers.
Note: Most of the left download links are for the iPhone. Go to the publisher website for other downloads.

OpenOTP Token (Recommended)

Platform: iPhone, Android
Type: Push notifications with One-Tap login, OATH Event-based (HOTP) & Time-based (TOTP)
Publisher: RCDevs
Download: Iphone Android

OpenOTP Token for IOS and Android is the official mobile Token application to be used with RCDevs' OpenOTP Server. It provides QRCode-based enrolment, Push notifications with One-Tap login, spoken OTP, fingerprint protection, phishing protection… It is fully compatible with Google Authenticator and can also be used with third-party cloud services and applications.

Google Authenticator

Platform: iPhone, Android, Blackberry
Type: OATH Event-based (HOTP) & Time-based (TOTP)
Publisher: Google
Download: Iphone Android Blackberry JavaPhone

One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH). Google Authenticator supports multiple accounts, key provisioning via scanning a barecode, manual key entry of RFC 3548 base32 key strings.

FreeOTP Authenticator

Platform: iPhone, Android
Type: OATH Event-based (HOTP) & Time-based (TOTP)
Publisher: RedHat
Download: Iphone Android

FreeOTP adds a second layer of security for your online accounts. This works by generating one-time passwords on your mobile devices which can be used in conjunction with your normal password to make your login nearly impossible to hack.

Authenticator

Platform: Windows Phone
Type: OATH Event-based (HOTP) & Time-based (TOTP)
Publisher: Microsoft Corporation
Download: WinPhone

A Windows Phone OATH Software Token designed to be a replacement for Google Authenticator. It supports QR Scan and the same features as Google Authenticator for Android/IOS.

Authomator

Platform: BlackBerry
Type: OATH Event-based (HOTP) & Time-based (TOTP)
Publisher: Pulsecode Inc.
Download: Blackberry

With Authomator, you can quickly generate two-factor authentication codes for your favorite services that use two-step verification on your BlackBerry 10 device.

OATH Token

Platform: iPhone
Type: OATH Event-based (HOTP) & Time-based (TOTP)
Publisher: Archie Cobbs
Download: Iphone

OATH Token is a free and open-source software token for two-factor authentication on the iPhone. OATH Token implements the RFC 4226 HOTP/OATH algorithm standard and is not tied to any proprietary server software. Multiple tokens are supported and may be fully configured as event-based or time-based. Tokens can be fully edited at any time, until if and when put in lockdown mode, after which editing is permanently disabled.

Mobile-OTP Token

Platform: JavaPhones, WindowsMobile, iPhone, Blackberry, Android
Type: Time-based (mOTP)
Publisher: Thomas Lederer
Download: Iphone

Mobile-OTP is a free 'strong authentication' solution for java capable mobile devices like phones or PDAs. It supports sending the secret key by email from the application when you use mOTP for the first time.
Java Phone version here: http://motp.sourceforge.net/MobileOTP.jar

If you are an OATH Software Token Developper and you want to be listed as an OpenOTP compatible software, please contact RCDevs.