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Yes, there are several open-source or free macro applications that you can use for desktop browsers. Here are a few examples:
1. AutoHotkey: This is a free, open-source scripting language for Windows that allows users to easily create small to complex scripts for all kinds of tasks such as form fillers, auto-clicking, macros, etc.
2. Pulover's Macro Creator: This is a Free Automation Tool and Script Generator. It is based on AutoHotkey language and provides users with multiple automation functions, as well as a built-in recorder.
3. TinyTask: This is a minimalist Windows automation app that you can use to record and repeat actions. As the name implies, it's unbelievably small, thus easy to operate.
4. Macro Recorder: This is not just a mouse recorder but a powerful automation software that can perform a variety of tasks.