Suggest Best Open Source HRMS Application

Hello All,

Can any one tell me some best opensource HRMS system that can be used in a small office with employees from 50-100.

I googled and found OrnageHRM but the installation of this application is very tough. I tried more than 7 times bt cant install it on on my webserver, howevr it runs perfectly on localhost with XAMPP server.
Please help me either providing proper installation guide of OrnageHRM or suggesting me something like this application.

Thanks in advance...