Numerous text mining systems for COVID-19 literature have been released in 2020 thus far. We compile a list of 39 systems in Table 2 (we maintain an up-to-date list of systems on the CORD-19 GitHub page https://github.com/allenai/cord19). These text mining systems are collected through a public form on the CORD-19 website, by searching COVID-19 papers and preprints in the CORD-19 corpus and from social media. We omit systems that appear to index documents using off-the-shelf software (e.g. ElasticSearch) without additional data or methodological extensions or without other obvious distinguishing system features.