The tetraevangelion Bodmer 25=Greg.-Aland 556 has now been digitized and is available at E-codices (Virtual manuscript library of Switzerland) here (via Jac Perrin who suggested to the people in charge that the MS be digitized.)There are many, many more digitized MSS out there – we have mentioned many on this blog. A few examples that I have looked at recently: the Bayerische Staatsbibliothek in Munich has put some Greek MSS on-line, including Gr. 472 (fols. 1-2, 372-373 = Greg.-Aland L1570) here.
Two other MSS that have been on-line for many years are Magdalen College, Oxford MS. Gr. 7 = Greg.-Aland 1907 and Gr. 9 = Greg.-Aland 57.