The grades of four Software stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

AVG Technologies N.V. (NYSE:AVG) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. AVG Technologies NV provides software and online services and solutions. It designs antivirus and Internet security products. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Earnings Revisions, and Sales Growth, AVG also gets A’s. The stock price has risen 7.8% over the past month, better than the 2.3% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of AVG stock.

This week, Activision Blizzard (NASDAQ:ATVI) pushes up from a C to a B rating. Activision publishes console, PC, online and handheld games. For more information, get Portfolio Grader’s complete analysis of ATVI stock.

This is a strong week for Ansys (NASDAQ:ANSS). The company’s rating climbs to B from the previous week’s C. Ansys develops and markets engineering simulation software and technologies used by engineers and designers working in fields such as aerospace, electronics, biomedical, energy, and defense. For more information, get Portfolio Grader’s complete analysis of ANSS stock.

DesCartes Systems Group (NASDAQ:DSGX) improves from a C to a B rating this week. Descartes Systems Group is a global provider of federated network and global logistics technology solutions that help its customers make and receive shipments and manage related resources. For more information, get Portfolio Grader’s complete analysis of DSGX stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.