CTRL + H         = C/C++ Search
CTRL + O         = Jump to Function (in the same file using a dropdown)
CTRL + SHIFT + R = Open File
CTRL + SHIFT + P = Jump to open/close bracket
CTRL + SHIFT + R = Open Resource (Files, etc.)
CTRL + SHIFT + T = Open Element (Class, Struct, etc.)

Eclipse Shortcuts
10 Eclipse Navigation Shortcuts Every Java Programmer Should Know
What is the keyboard shortcut to go to a file in Eclipse?