Poedit
Poedit is one of the most populare programs to edit languages files. The free version has plenty of options.
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Free Sofware
LibreOffice
LibreOffice is a free and powerful office suite, and a successor to OpenOffice.org (commonly known as OpenOffice).
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Active Presenter
ActivePresenter is a screencasting and eLearning software which can be used to create software demonstrations, etc.
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