What are some alternatives?
When comparing Heritage Cirqa and SLIM21, you can also consider the following products
Mandarin Library Automation - Mandarin Library Automation helps librarians and teachers to bring relevant, current information to libraries and classrooms.
LibraryH3lp - LibraryH3lp provides a flexible, affordable customer service software platform for libraries, educators, and non-profits that combines website chat, texting, email, and knowledge bases.
LIBSYS7 - LIBSYS7 is a library management software that offers solutions in library automation, RFID and digital resource management.
LIBRARIAN - Comment on any arXiv paper
Follett Destiny Library Manager - Follett Destiny Library Manager is a complete library management system that can be accessed from anywhere.
Eloquent Library - Eloquent Library contains all the functions available in traditional Integrated Library Systems, plus everything required to build and maintain a virtual library.