Or
In addition, I have been using a Linux user since 1996 and have been involved in the MythTV Open Source project since 2004, which allowed me to gain a good knowledge of Linux and the Open Source technology.
Which one is the most appropriate in your opinion? btw, is this entire sentence grammatically correct?
In addition, I have been using a Linux user since 1996 and have been involved with the MythTV Open Source project since 2004, which allowed me to gain a good knowledge of Linux and the Open Source technology.
' A possible sentence revision-- In addition, I have been a Linux user since 1996 and have been involved in the MythTV Open Source project since 2004, which has enhanced my knowledge of Linux and the Open Source technology. )
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