3 Software stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

The rating of Adobe Systems Incorporated (ADBE) moves up this week, rising from a B to a A. Adobe Systems Incorporated is a global software company that offers creative, business, web, and mobile software and services. The company also gets A’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of ADBE stock.

Synopsys, Inc. (SNPS) is seeing ratings go up from a C last week to a B this week. Synopsys, Inc. is engaged in the electronic design automation software and related services for semiconductor design companies. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of SNPS stock.

Zynga Inc. Class A (ZNGA) improves from a C to a B rating this week. Zynga Inc. Class A develops, markets, and operates online social games as live services played over the Internet and on social networking sites and mobile platforms. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of ZNGA 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.