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) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. AVG Technologies engages in the development and sale of Internet security software and online service solutions under the AVG brand name. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Earnings Revisions, and Sales Growth, AVG also gets A’s. For more information, get Portfolio Grader’s complete analysis of AVG stock.

Activision Blizzard (NASDAQ:ATVI) earns a B this week, jumping up from last week’s grade of C. Activision publishes console, PC, online and handheld games. For more information, get Portfolio Grader’s complete analysis of ATVI stock.

Ansys (NASDAQ:ANSS) improves from a C to a B rating this week. 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) is seeing ratings go up from a C last week to a B 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.