There are two kinds of software.
1. System software. it is called Operating system/ OS. Such as: Windows, mac, Linus, Android, Symbian or something like these.
2. Application Software. Such as: Microsoft Office, Excel, Adobe photoshop, Illustrator or something like these.
Here you will be able to get many important software for both 1. Computer & 2. Mobile/ tab device.
A. Dropbox / No sign in required.
A.1
B. Google user only/ Sing in required by google id.
1. Windows Operating Application Software
1.a) Desktop Computer Only
1.b) Laptop Only
2. Mobile or Tab device