Hexlock - Security app locker keeps apps private with smart profiles for any situation
Free File Splitter - File Splitter is a handy freeware program which allows to easily split and merge files
App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
HJSplit - HJSplit is a popular set of freeware file-splitting programs created by Freebyte.
AppLock (FOSS) - A privacy App lock FOSS application.
Batch File Split & Join - Split and merge multiple text or binary files in either character, line, or byte modes. When splitting files, you can split on certain text or binary separator; target given number of parts; or target specific part size. Join files on lines/bytes.