6. Software not softwares
"Software" can be singular or plural. Never use "softwares."
5. Do the quotes go after or before the period?
Put quotes after a period or comma. Put quotes before a colon. Put quotes after a question mark unless the entire sentence is a question. This is a US English standard. British English usage can differ.
Examples:
He asked, "Are you hungry?"
She replied, "Yes, I am hungry."
Did she say, "Yes"?
4. There, their, or they're
"There" is used in two ways. It can specify a place. It can also be used as an expletive or empty word to start a sentence.
"Their" is used as a possessive form of "they".
"They're" is short for "they are."
Examples:
I live there, not here.
There are nine planets in the solar system.
The two boys raced their bikes.
They're both tired after walking up the stairs.
3. Powerful
Too many developers describe their software as, "XXX Software is a powerful, easy-to-use, ... ." I searched download.com and found 2149 descriptions or titles of software containing the word "powerful." Powerful has many meanings, most referring to how effectively something is performed, as in muscular. A car with 450 horsepower is clearly more powerful than one with only 200 horsepower. But what is powerful software? If you mean feature-rich (like Adobe Photoshop), then say so. If your software does only one thing, but it does it completely or thoroughly (like CounterSpy), then say so. But please, no more powerful software.
2. Site or sight