There are actually some situations where opening a new window makes sense. In the most cases it is fine to let users decide, if they want to open a new window or not. So not forcing this behavior on them may be a good option.
If you decide nevertheless that forcing links to open in new windows is the right option for your use case, the two links provided basically do the very same thing. The Bitvoodoo-app is probably easier to use for non-technical users.
We have created an app for Confluence, that will allow you to link other legacy apps easily and let users choose software, that they use often. We call it App Center - Access Your External Tools.