I've been working with the DHIS software for some time (DHIS2.org). It is designed for use in developing countries to collect health data. It is browser based software which has been optimized for low bandwidth and poor connections.
The Raspberry Pi makes a good, low cost data entry and reporting terminal.
I used the standard Raspbian Debian distribution and added the Chromium browser from the repositories. I also added Abiword and Gnumeric for work processing and spreadsheets since the DHIS software can export data in spreadsheet format for further manipulation.
It turns out that the standard Raspberry Pi works well in this configuration. Since the DHIS software is designed to perform most of its processing on the server, the response for data entry and reporting is very acceptable.
Since it is Linux, you can also add packages like dnsmasq which can be used to lock down the computer so it can only be used for authorized Internet access. This is important in areas where bandwidth is expensive and slow to prevent Facebook and other Internet activities to eat up all of your bandwidth.
The Chromium browser and DHIS also support offline data entry which works well when you have poor Internet connections.
I've put together a video which demonstrates the use of the Raspberry Pi and this software so you can see how well it works.
The cost of the Raspberry Pi, a keyboard, mouse and monitor makes for a very low cost computer that fits the budget of developing countries.
The YouTube Video demonstration is here: