Yesterday I installed a free library system in my NEW netbook (my mom couldn't take the cuteness of it since she would always squint at the monitor, so she swapped with my three year old 15" laptop!!). It's the Open Biblio that's written in PHP. I'll make it work for the book club I belong to.
Updated!!
Here is the procedure for a useful install:
1. First you have to have the XAMPP. This is the Apache-MySQL-PHP trio that must be installed before OpenBiblio can work. Download it from http://www.apachefriends.org/en/xampp-windows.html (use this if you have Windows OS).
(Actually any other software that will quickly install AMP (Apache-MySQL-PHP) will do, like EasyPHP or WAMP.)
Install this. Follow instructions from the website. Take note of the folder where the files are. One subfolder will be the 'htdocs'. You need to start the Apache and the MySQL - do this from the control panel of XAMPP.
2. Download the OpenBiblio installers from http://sourceforge.net/projects/obiblio/files/. Copy the folder under subfolder htdocs.
3. Create an OpenBiblio database in MySQL. How? Under XAMPP, click the MySQL Admin button from the Control Panel. Locate button that says Create database, and type in OpenBiblio, press ENTER.
4. Grant privileges to your username. From the MySQL screen, click on the SQL button and type these:
grant all privileges on OpenBiblio.* to obiblio_user@localhost identified by 'obiblio_password';
You may change obiblio_user, and obiblio_password as you wish.
5. Under the main openbiblio folder, locate the database_contents.php file. Match the username and password here to those you used in step 4.
6. Type http://localhost/openbiblio/install/index.php on the address bar of your browser. This is to create the tables under the database you created in step 3.
7. Open OpenBiblio by typing this on your browser: http://localhost/openbiblio/index.php. Login using username 'admin', password 'admin'.
Good luck!
References: http://www.iuta.uniovi.es/biblioteca/install_instructions.html, http://www.slideshare.net/vimal0212/installation-of-openbiblio-using-easyphp