JAFROC 4.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This free program was originally designed by DevChakraborty.
JAFROC lies within Home & Hobby Tools, more precisely Healthcare & Fitness. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
JAFROC analysis is intended for analysis of human observer free-response data (Chakraborty et al. 2004). JAFROC software is available on this website. It is very important that the FROC data be collected properly; see recommendations.
JAFROC has been extensively validated using a simulator that included inter-image and intra-image correlations of the ratings (Chakraborty et al. 2004).
You may want to check out more software, such as DIABASS, YogaTrainer or Office Yoga, which might be related to JAFROC.