There are a lot of good graphical user interfaces for TeX nowadays:
- TeXstudio: supports Windows, Mac and Linux. CTRL-<space> activates completion. F7 opens the builtin PDF viewer. CTRL-click jumps between source and PDF preview.
- TeXworks: supports Windows, Mac and Linux. CTRL-click jumps between source and PDF preview, <Tab> activates source completion.
- gedit LaTeX Plugin (rubber xetex support patch): CTRL-<Space> activates completion.
- A Look at 8+ Free LaTeX Editors by Kevin Klement, July 2010