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Digital Research C is a compiler developed for use with Digital Research's CP/M systems. It was also ported to DOS.
PL/I is a programming language oriented towards scientific and business programming. Digital Research provided implementations for their CP/M operating system as well as MS-DOS.
PowerQuest Search & Rescue is an advanced file recovery tool. It operates as a set of bootable floppy disks that can scan a FAT or FAT32 hard drive, piecing together files even when partitions or file systems are damaged.