Open Manager is a free and open source file manager that will run on Android 1.5 and above. Open Manager is licensed under the GPL v3. Because this is an open source project, it will always remain free and free of ads.
Open Manger version 1.0 can:
copy/paste files and folders
rename files and folders
delete files and folder
create new folders
search for files and folders
sort files and folders
display hidden files and folders
display folder information (e.g size, number of files etc...)
zip folders
unzip zip files
attach files to email
view and kill running processes (to free up phone memory)
backup all of your downloaded (third party) applications
install applications that did not come from the Market Place.
preview audio, video and image files.
Version 1.1.2 (published Aug 9 2010)
added multi-select ability
now displays folder size (number of elements in the folder)
bug fixes