Select the version that matches your Eclipse’s version and click Install button.
Eclipse will send query to its server and display results as shown below: The Eclipse Marketplace dialog appears, type Spring Tool Suite or STS into the Find textfield and hit Enter.
Click Help > Eclipse Marketplace… from Eclipse’s main menu.
If you are already using Eclipse IDE, you may consider installing STS as a plug-in for your existing Eclipse, because that’s faster than downloading the STS separately.Installing STS from within Eclipse IDE is pretty simple, follow these steps: It can be either installed as a standalone IDE or as a plug-in in Eclipse.
Spring Tool Suite (STS) is an Eclipse-based IDE which is optimized for developing Spring framework-based projects.