The Library Management System for Small Libraries


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BIBFRAME Linked Data

Upcoming BIBFRAME Editor, stay tuned! Read this presentation for an introduction of library linked data

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BIBFRAME linked data is stored in the build-in triplestore and is available for SPARQL querying.

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About SLS

SLS is a library management system developed by a voluntary group of professional librarians since 1991 (see its early history and an historical image of the DOS version of OPAC released in 1992). It is specially designed for small and medium sized libraries, including school, special, and church libraries. It has everything you need to get your library running smoothly and effectively. You can install the system either on a standalone computer, hosted locally within your institution or on the service provider's data center.

Download SLSCloud information brochure


SLS Software is currently distributed through TR Computer Limited. They can be reached by calling (852) 2772-1619 or sending email to


SLS announces the release of SLSCloud OPAC Version 5.3.2 (2020-01-12)

Several enhancements and updates are added to this December 2019 release, together with the software refreshed to support the latest version of WordPress.

SLS announces the release of SLSCloud OPAC and SLS Software Version 7.0 (2015-11-22)

SLSCloud OPAC is now in general release. Apart from having a completely new look and a fully mobile device responsive design, a number of features are introduced. With the new Login and My Account functions, patrons can directly view their own circulation activities, reserve items and renew their borrowed books. Users can toggle the display in both English and Chinese language at anytime they want. Search results are automatically populated with book cover images. Any many more...

We have also refreshed the SLS Software (i.e. all Windows and Web modules) and have released it as Version 7.

TR Computer to provide SLS Support Services (2015-06-27)

SLS Library Technology Group is pleased to announce the appointment of TR Computer Limited to provide professional technical support services to both existing SLS users and new users. Starting today, TR Computer will take over all the services that Micrologic Technologies provided.

We would also like to thank our long time partner Micrologic Technologies for their committment and contribution in the past 16 years in supporting the SLS Software. All the best to Thomas!

SLS announces the release of slsSIP (2013-04-20)

SLS Library Technology Group is pleased to announce the release of the slsSIP software. After several months of pilot implementation at Pui Ching Middle School, the software is now ready for general release. slsSIP provides a SIP2 communication interface between SLS Software and circulation devices such as self-check machines or circulation stations at the library counter.

slsSIP is available free-of-charge for SLS users who need it for implementating self-check machines and/or circulating their books with RFID tags.