ChurchInfo is an open-source project which is free to use forever if you want to download and maintain your own installation. It is impossible to know how many churches are using the software today. There have been tens of thousands of downloads and hundreds of churches have actively communicated with the ChurchInfo team about their installations.
There is a new option available from ChurchInfo Services (churchinfoservices.com). They will host your ChurchInfo installation and help with any issues that come up.
ChurchInfo Team Leader