To help players establish their population growth, a population growth calculator would be awesome. Simple version could just allow you to pick a base population and growth rate and calculate the next decaturn growth for you, but advanced versions could have all sorts of cool features (pick which ones you like):

• Multiple turn development
• Allow reading growth rate from factions on wiki in addition to manual selection
• Allow reading base population from factions on wiki in addition to manual selection
• Generate a graph with the growth over time
• Automatically generate a line to put in your turn report