DrRacket 5.2.1 freeware    

Author PLT Scheme Inc. OS WinXP, Windows Vista, Windows 7 Date Released February 06, 2012 Downloads 185 Filesize 31.80 MB Keywords graphical environment, programming environment, static debugger, stepper, environment, programmer Your Rating   - click to rate - you will be first!

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Racket's interactive mode encourages experimentation, and quick scripts easily compose into larger systems. Small scripts and large systems both benefit from native-code JIT compilation. When a system gets too big to keep in your head, you can add static types. Draw more pictures or build a web server from scratch. Racket includes both batteries and a programming environment, so get started! ...

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Code - DrRacket freeware - The Latest Versions History

Version	Date Released	Status	Release Notes
5.2.1	Feb 6, 2012	New Release	· Performance improvements include the use of epoll()/kqueue() instead of select() for the Racket thread scheduler, cross-module inlining of small functions, and the use of SSE instead of x87 for JIT-compiled floating-point operations on platforms where SSE is always available (including x86_64 platforms). A related change is the interning of literal numbers, strings, byte strings, characters, and regexps that appear in code and syntax objects. · DrRacket uses a set of composable ray-traced icons available from the new images library collection. · Typed Racket's typecheck-fail form allows macro creators to customize the error messages that Typed Racket produces. This is especially useful when creating pattern matching macros. · The performance of Redex's matcher has been substantially improved; depending on the model you should see improvements between 2x and 50x in the time it takes to reduce terms. · Plots look nicer and are more correct at very small and very large scales.
5.2	Nov 14, 2011	New Release	· DrRacket comes with an experimental, on-line check syntax tool, although this new tool is disabled default. See below for more information. · The new db library offers a high-level, functional interface to popular relational database systems, including PostgreSQL, MySQL, and SQLite, as well as other systems via ODBC. · A new XREPL collection provides convenient commands for a plain racket REPL. It is particularly convenient for people who prefer console-based work and alternative editors. See also the new chapter on command-line tools and other editors at the end of the Racket Guide. · The plot collection has been reimplemented in Racket. It now offers PDF output, log axes, histograms, and more. Some code that uses plot will still work, and some will need light porting. The plot/compat module offers expedient backward compatibility. · DrRacket uses more conventional key bindings: C-t creates a new tab, C-w closes the current one, and C-r runs the definitions.
5.1.3	Aug 17, 2011	New Release	· This is a bugfix release, resolving the DrRacket issue with the contour view. In addition, two tex files with problematic licensing were removed.
5.1.2	Aug 5, 2011	New Release	· Racket now includes a new racket/place library to support parallelism, complementing racket/future. Racket's parallel build process is now based on places instead of multiple OS processes. · Places support share-nothing parallelism and message-passing communication. Compared to futures, places are heavyweight, but they have a simpler performance model. · The syntax-certificate system has been replaced by a syntax-taint system. Both certificates and taints were designed to protect otherwise inaccessible bindings from abuse when they appear in macro expansions. Taints are simpler and lighter, and the switch closes known holes in the certificate system. Macros that are not implemented with syntax-rules or define-syntax-rule, however, must explicitly use syntax-protect to protect their expansions from abuse. · The net/url library supports HTTPS connections, but beware that by default all sites are accepted (equivalent to ignoring a browser's warnings about untrusted certificates).
5.1.1	May 16, 2011	New Release