Lightning disk cache, from Personal Computer Support Group, is one of the earlier disk caching programs for MS-DOS IBM PCs and compatibles. It supports read and write caching of both floppy and hard disk drives, and can use EMS memory. as smaller name programs such as Super PC-Kwik.

LinkRight is a serial/parallel port file transfer utility for OS/2, and includes a DOS version. The included LinkRight Cloner tool copies a complete OS/2 partition including boot information. It is similar to LapLink, and can use a "LapLink" parallel cable.

Logictree, From CAM Software, is an easy to use Expert System program that makes decisions based on a programmed "tree" of information.

Lotus 1-2-3 was an early spreadsheet application available for MS-DOS. It became extremely popular in the late 1980s, displacing the former leader VisiCalc. Lotus had difficulties adapting 1-2-3 to the Windows environment, and was overtaken by Microsoft Excel. Spreadsheet functionality was also included in Lotus Symphony. Later versions were included in Lotus SmartSuite.

Agenda is DOS based Personal Information Manager that features customizable categories, and many data retrieval features. It was criticized for not being easy to use and lacking features found in other PIMs. It was replaced by Lotus Organizer.

Lotus Approach, originally from Approach Software Corporation, is a relational database management system. Approach promises "instant productivity" with its WYSIWYG form and report designer, and is compatible with many existing database formats. Approach started off as an independent product, was purchased by Lotus, and later IBM. It was included in Lotus SmartSuite for Microsoft Windows.

Lotus HAL (Human Access Language) is a natural-language querying interface for Lotus 1-2-3 r2. That is, one can enter standard English phrases instead of typing "complex" formulas.

Magellan was a desktop file viewer and search tool. It indexes all files on your hard drive, and you can search for related information across file formats.

First released in 1986, Lotus Manuscript is a sophisticated word processor geared toward scientific technical writing. It features easy table editing, the ability to easily edit and print mathematical equations, and can handle very complicated documents. It also includes footnoting, document tracking, import from 1-2-3, and mailmerge. Version 2 adds macro and downloadable font support.

Lotus Metro is a set of resident desktop management tools similar to Borland Sidekick or Popcorn desktop. Metro includes an appointment book, phone book, scheduler, calculator, clipboard, and a text editor. A user can call up these tools while almost any other DOS program is running. In addition to performing small tasks without exiting their primary program, Metro can copy information from or to the screen. It also include macro functionality for automating tasks comparable to Borland SuperKey. It was primarily targeted at existing users of Lotus 1-2-3 and Lotus Symphony.

Lotus Symphony is a an integrated software program that combines five tools: spreadsheet - word processing, graphics, database management, and data communications - in one package. The spreadsheet has similar functionality to Lotus 1-2-3, however it uses a different software "engine". These releases are of the original suite produced by Lotus. For the unrelated suite produced by IBM under the same name, see "IBM Lotus Symphony".

Formerly Electric Desk/AlphaWorks from Alpha Software, Lotus Works is an all in one office suite for DOS that includes a word processor, spell check, spreadsheet, graphics, database, and communications. It targeted the lower end and first time computer buyers. It competed against other all in one office suites such as FrameWork, PFS First Choice, and Microsoft Works

Lucid 3-D, created by PCSG, Inc. and sold by DacEasy, Inc., is a spreadsheet program for MS-DOS. The feature that sets it apart from others is that it is memory-resident, so you can bring it up on top of other DOS programs and exchange data with them. Unlike simple TSRs, however, Ludid 3D is a full featured spreadsheet. It features linking, macros, windowing, intelligent recalculation, background recalculation, and user-definable functions.

Lumina is a comprehensive, feature-packed, high resolution, high-end graphics drawing system targeted at professional computer artists. It requires the use of high resolution displays and graphics tablets. Time Arts also produced video and tablet hardware as well as complete computer systems.

The Mace Utilities, from Paul Mace Software, is a suite of disk and system tools similar to the Norton Utilities and PC-Tools. Notable features in included the ability to undelete files, recover re-formatted disks, a defragmenter, and disk caching software. In 1989, Paul Mace Software Inc sold the Mace Utilities to 5th Generation Systems. After "Mace Express" in 1991, the product seemed to vanish?

Magic Mirror is a memory-resident program that lets you reformat and transfer data between incompatible programs. You highlight data on your screen to store it on disk in a memory buffer limited only by your disk space. You can then call the data from the disk and format it for the program you want to send it to.

A set of financial calculation programs written in Basic.

Managing Your Money is your easy-to-use personal finance manager. MYM has all you'll need to take control of your finances. You can automate your checking account, track credit investments, reduce your debts, plan your savings, decide whether to refinance your mortgage, and much more. You don't have to use all this at first or ever. But it's nice to know its all here when you need it. It is sometimes titled as "Andrew Tobias' Managing Your Money".

Map-Master is a map generation and plotting tool that includes state map boundaries, statistical information, and areas within states. It support outputting maps to a number of high resolution plotting devices. Additional map data was available for purchase from Decision Resources.

The Ashton-Tate Master Graphics Presentation Pack is a bundle of Ashton-Tate's graphics programs. This includes Chart-Master, Diagram-Master, and Sign-Master. These appear identical to the standalone versions, the only different is the inclusion of a unified menu disk.

MasterModeller is a model-designing program. With it, you design financial models that enable you to analyze your figures, produce forecasts, and test the effects of decisions. You can set up as many models as you like, sort them all on disk, and use them whenever you need to.

MasterType Training Ground is a typing tutor game for the IBM PC.

Mathcad is an easy to use graphical calculation program targeted at engineering professionals. It supports a wide variety of mathematical functions. There were versions for DOS, Macintosh, and Windows.

MatLab is a high speed, interactive programming utility for manipulating, calculating, and plotting complicated mathematical equations. It is considered easy to use for those familiar with typical algebra equations.

An interactive typing tutor for the IBM PC that uses a variety of entertaining learning styles.