Document explaining the development of a bc/dc clone. Might be a good example to follow, if I ever make a public project.

Software that aims to provide an easy to use (hopefully) universal blackbox for solving polynomials and secular equations.

Among its features you can find:
- Arbitrary precision approximation.
- Guaranteed inclusion radii for the results.
- Exploiting of polynomial structures: it can take advantage of sparsity as well as coefficients in a particular domain (i.e. integers or rationals).

It can be specialized for specific classes of polynomials. As an example, see the roots of the Mandelbrot polynomial of degree 2.097.151 computed in about 10 days on a dual Xeon server.

If you use MPSolve in your research, please cite it as follows:
Bini, Dario A., Fiorentino, Giuseppe, Design, analysis, and implementation of a multiprecision polynomial rootfinder. Numerical Algorithms 23.2-3 (2000): 127-173.
Bini, Dario A., and Robol, Leonardo. Solving secular and polynomial equations: A multiprecision algorithm. Journal of Computational and Applied Mathematics 272 (2014): 276-292.
Found via https://en.m.wikipedia.org/wiki/Aberth_method and https://en.m.wikipedia.org/wiki/MPSolve
See also the GitHub repository http://github.com/robol/MPSolve.git A simpler implementation of the Ehrich-Aberth-method can be found in https://github.com/robol/ea-roots

primecount is a command-line program and C/C++ library that counts the number of primes ≤ x (maximum 1031) using highly optimized implementations of the combinatorial prime counting algorithms.
Found via https://www.cliki.net/primecount and https://github.com/AaronChen0/primecount

Implementations in Basic and C.

There are Valgrind tools that can automatically detect many memory management and threading bugs, and profile your programs in detail. You can also use Valgrind to build new tools.

Detailed description of the stack layout, use of R5 as frame pointer by the (V6) Unix C compiler on the pdp-11.

The Amsterdam Compiler Kit is a cross-platform compiler and toolchain suite that is small, portable, extremely fast, and extremely flexible. It targets a number of low-end machines including the Z80, 8086 and 80386, but there are many other code generators available. It supports several languages, including ANSI C, Pascal and Modula-2, and contains integrated runtime libraries including a libc.

The maintainer, David Given states "I, dtrg, cannot honestly recommend using the ACK for production code unless as a stop-gap measure or unless the other benefits of the ACK (e.g. having a very lightweight turnkey toolchain is valuable to you) outweigh the code quality."

Interesting software, such as
unifdef selectively removes C preprocessor conditionals. My version of this program now shipped by all the BSDs (including Mac OS X) and is used by the Linux kernel build system.
regpg safely stores server secrets using gpg, so you can keep them in version control.
picoro - tiny coroutine implementations in pure C. I wrote an accompanying article, coroutines in 20 lines of standard C.
Counting the days - tiny routines for converting Gregorian dates into linear counts, like Julian day numbers or Unix time_t. The date of the count - a small routine for converting linear day counts into Gregorian dates.
https://dotat.at/@/2016-04-22-synergy-vs-xmodmap-fight.html Why you can't use xmodmap to change how Synergy handles modifier keys
His log of links, https://dotat.at/:/ which I found on the TUHS mailing list is also worth reading. He explains a bit about this log on http://dotat.at/.

Blog about Unix, C, system administration and more. See for example
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/NotificationsVersusLogs
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/IdentifyMachineEmailByRootName
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/ProceduresAreNotDocumentation
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/RCStoMercurial  Instructions for converting files/directories controlled with RCS to Mercurial.
TODO: mention M-x vc-revision-other-window. Saved Tue 2019-10-29 17:02:29
https://utcc.utoronto.ca/~cks/space/blog/unix/V7WhyItMattersSoMuch  found Mon 2022 -01-10 13:12:03 on https://irreal.org/blog/?p=10149
https://utcc.utoronto.ca/~cks/space/blog/linux/UbuntuKernelAutoremove  MIght want to see whether this is relevant for me. Saved Tue 2017-03-28 19:10:35

See the output of several compilers in your web browser.
In addition to C++, it now supports Go, Rust and D.