The downloads themselves are free, but the license of the applications you download can be different. For example, one app is DEMO and another is Trial. If you visit an program's page, you'll see its license type on the left side.
Here some details about them:
- OpenSource: Free to download/ source code available under GPL or other terms.
- Free: Free to download and use.
- Demo: Free to download but with limited functions
- Trial: Free to download, but expires after some time (30 days after installation)
- Shareware: Needs purchasing to unlock various features, free to download.
- Commercial: You can download after you pay for a license/subscription.