That may sound silly but humble Notepad++ should be a part of your list of great opensource software. Although at first glance it does not require spending time on learning its functionalities it offers a lot of plugins that allow to replace proprietary software (i.e. I'm using XML-plugin and that allows me to work with XMLs without using specialised software like Altova).
Also TrueCrypt - I'm using it all the time (although there are changes in maintenance community the last stable version was proven to be clean - I still trust old good truecrypt)
Comments
That may sound silly but humble Notepad++ should be a part of your list of great opensource software. Although at first glance it does not require spending time on learning its functionalities it offers a lot of plugins that allow to replace proprietary software (i.e. I'm using XML-plugin and that allows me to work with XMLs without using specialised software like Altova).
Also TrueCrypt - I'm using it all the time (although there are changes in maintenance community the last stable version was proven to be clean - I still trust old good truecrypt)
+1 Notepad++, I live in it when using a Windows machine. I wish it was available for OSX.