The best replacement for gridbaglayout is gridlayout.

The best alternatives to gridbaglayout are rated as following:
★★★★★  gridlayout
★★★★  miglayout
★★★  grouplayout
★  borderlayout

Your alternative for gridbaglayout is not listed? Suggest!
Speaking about gridbaglayout, one probably shouldn't forget about jpanel.

Other search terms related to gridbaglayout and their ratings are:
★★★★★ jpanel
You have in mind a companion for gridbaglayout and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gridbaglayout in all years. Click on graph for more.
gridbaglayout
gridlayout
miglayout