What it is:
GenProg is a free genealogy program that uses non-proprietary tables to store data.

Features:
GenProg allows you to track your pedigree back as far as you can go. Version 1 had a practical limit of approximately 1000 years. Version 2 has been tested back 1500 years but should be unlimited. There is now no limit to the number of cousins that can be tracked (version 1's limit was 10^th cousins). The Report generator and the Display are customizable for spouses, children, and census returns so you can limit a report to just one spouse or all spouses that either person was married to along with just their children or all children of all spouses. Or anything in between. The Census tab allow you to track where a family was at a given time with a glance. These can be tailored to show other records such as tax records or deeds to aid in tracking a family's movements. There is room for extensive individual notes and family histories which can then be printed from the program.

New Features for version 2
• Changes to the layout of several of the forms.
• More choices for text and colors.
• Customizable display and reports.
• Program capacity is now one billion persons. However, I expect the 2GB file size limit will be reached first.
• Ahnentafel number limit is in excess of 74,491,912,863,744 (about 1500 years).
• Dynamically generate Pedigree charts in HTML (up to 13 generations per chart).
• More reports.
• Individuals will be fully linkable (i.e. you will be able to add the parents/families of step-parents and parents/families of the spouses of aunts and uncles and THEIR parents etc. and if they connect back into the tree, you can do so). The goal being to create a true "World Connect".
• Search by partial or full name or by record number.
• Behind the scenes - major changes to data tables.

System Requirements:
GenProg will run on a 486-133Mhz (if you can find one...) but a Pentium/K6-500 is recommended as a minimum. As always, more is better. The program requires less than 1MB to install but can grow to four, five, or possibly 10MB or more as you add family members and background.
Operating Systems: Windows 95, 98, NT4, and XP. (Windows 2000, and Millennium are assumed. Vista users (and XP users without administrator priviledges) may have to install to a directory outside of "Program Files" due to security restrictions). GenProg looks best if color depth is set to 32bit otherwise some of the icons won't look their best.
It should run on Linux under WINE. This is unconfirmed at the moment.

Update: GenProg will be compliled under VFP9 which means a better looking interface and controls but will no longer run on Win95 or NT4.
Screenshots: ...