Here's how you can install App Grid, an alternative to the Ubuntu Software Center, in Ubuntu 13.04. You can filter apps by name and rating, categories, as well as installed or pending installation. Sign in with your Ubuntu One account to buy apps or post reviews.
1. Open a terminal window.
2. Type in the following commands, then hit Enter after each:
sudo add-apt-repository ppa:appgrid/stable
sudo apt-get update
sudo apt-get install appgrid
App Grid Features and Technical Comparison
Here's a list of features and a technical comparison with the Ubuntu Software Center, from Ubuntu Discourse:
discover new apps every time you open App Grid,
search, filter and sort to find exactly what you're looking for,
make informed decisions with our extensive detail views,
sign in with your Ubuntu One account to review and purchase apps.
A few little technical comparisons between App Grid and the Software Center stack:
python3 vs python2,
warm start to home screen is 2.7s vs 20s,
warm start to details screen (eg opening an apt: link) is 2.3s vs 30s,
full database build is 58s vs 6min24,
initial database size is 36.7mb vs 96.5mb,
memory usage after startup to home screen is 20mb vs 53.6mb,
lines of code is somewhere around 5900 loc vs 56960 loc (incl tests etc)."
Additional Resources for App Grid
Read more: Noobs Lab