Gjar

If you need a simple and tiny software to build jar files, Gjar can be an excellent option. This Java-based program lets you create jar files with extreme ease by using drag n drop. What's more, you can also use it to generate executable jar files by selecting the relevant class files from the file tree. Additionally, Gjar enables you to customize the classpath, which can be immensely useful for developers.

One of the most likable features of Gjar is that it keeps you from making mistakes. For instance, if you collapse a directory tree before creating the jar, the program will warn you right away. This can save you a lot of time and effort in the long run. Overall, if you're looking for a straightforward and effective tool to build jar files, Gjar is worth trying out. Plus, it's completely free, so you have nothing to lose.