Category Archives: OpenSource

Home / Technology / OpenSource
6 Posts

One Sheet Solar Cooker – Appropedia: The sustainability wiki.

One Sheet Solar Cooker

Cocina_Solar_Simple in Spanish / en español.

Cocinasolarsimple.png 9 june 2008

This is the simplest solar cooker I’ve been able to design:

  1. Use a cardboard sheet 60 cm x 80 cm or larger.
  2. Draw lines to divide in 2×3 parts, and cut “A” lines only.
  3. The dotted lines are all for concave folding, so you can make a careful “half-cut” and then it will be easier to fold.
  4. Make two holes, so that the string will go through the holes once the red parts are below the yellow part. The string is knotted like your shoes’. Not a permanent knot because you want to be able to take the kitchen to other places.
  5. Glue foil paper to the part of the cardboard closer to you. Maybe the inner side of some fried chips bags. If there’s no glue you may staple it.
  6. The bottle with the bottom cut off (and discarded, unless you find a use for it) helps in getting more greenhouse effect. You can place it on a circle made of sand so that it’s more air-tight, so almost no heat should come out there.
  7. Inside the “greenhouse” you could place a glass jar, with its lid. Both the jar and the lid can be painted black with some kind of paint that doesn’t produce toxic vapour when heated. Coal with rice water or something.


Careful, it’s hot! I don’t think temperature goes above 100ºC. Use folded cloth or gloves to grab the hot jar.

Public domain, so copy, modify and use at will. Experiment and tell us.

I do not share the optimism of the designer for being able to make this house for $300, in reality it will cost more than $500 or even closer to $900 but still it is a very good value for a house of this quality.

There are a few issues that the designer of this house did not think of, the first is that CEB is not water proof, if the house is not elevated, then the first 50cm of the walls needs to be sealed very well, either by using an alternative type of block or by using cement blocks.

But overal, this is an excellent idea, good starter to promote the awareness of possibilities using CEB in low cost housing in developing countries.

The CEB used in this design can be made using our open source CEB press machine:


via Geopolymer CEB House – $300 Challenge – Rebuild Haiti Better.

Final CEB House with Split Bamboo Screening – credits: Owen Geiger

 All Rights Reserved

20 Ways to Circumvent Egypt’s Internet Block by @AnonymousRx (Twitter account)

DISCLAIMER: I am not a member of the group “Anonymous” and I do not support their actions with regard to “Operation Payback”. If you recall, they had temporarily stopped the internet servers for MasterCard, VISA, PayPal, etc.

That said, if you know anyone in Egypt who is trying to get information online or transmit vital information online, here are 20 ways around the government’s internet blockade. Remember, the fight for freedom and Democracy is everyone’s fight.

  1. Nour DSL is still working in Egypt, Dial up with 0777 7776 or 07777 666
  2. IP addresses for social media: pass on to people in #Egypt: Twitter: Facebook:
  3. How to circumvent the communications blackout in #Egypt Arabic
  4. #hamradio frequencies for #egypt PLEASE SPREAD IRC:
  5. Ham Radio Software software for PC, Mac and Linux Communicate w/ #egypt
  6. TOR Bridge 04FD6AE46E95F1E46B5264528C48EA84DB10CAC4
  7. There is an Old DSL Dialup 24564600
  8. Send SMS reports to +1 949 209 7559 and they will retweet for you. Please spread to those in #Egypt on battlefield
  9. #Egypt hams are on 7.050-7.200 MHz LSB
  10. Egypt Gov only blocking by DNS. So for Twitter try Facebook
  11. VPN Server is now stable and open for FREE to ALL
  12. 12] Help the Egypt Revolutionaries by overcoming the Firewall
  13. 0m band, 7.050-7.20­0 MHz LSB, 318.5 degrees (northwest­/north from cairo) Ham Radio Operators
  14. We are now providing dialup modem service at +46850009990. user/pass: telecomix/telecomix (only for #egypt, respect that PLEASE!).
  15. People of Egypt ONLY! Use this dial-up provided by friends in France to go online: +33172890150 (login ‘toto’ password ‘toto’)
  16. FREE VPN Server to bypass ANY Blockage on ANY ADSL or Cell Network. Domain: User: FreeEgypt Pass: #Jan25
  17. Third party apps: Tweetdeck and Hootsuite still work for updating Twitter
  18. xxxxxxxxxxxxxxxxxxxxxxxxxx
  19. RetroShare: secure communications with friends
  20. Follow @AnonymousRx

Please help support #OpEgypt and join anonymous in IRC chat, you can use a secure web version of IRC called Mibbit @
Ask what you can do to help when in the chat channel,

I found these while I was looking for applications to make my PC safer and faster.

Some of them are easy to use for ordinary users, but most of them are for advanced users who know what they want and how to tweak your PC to get better performance.

Hope you find them useful.

  1. PING – I may be beating a dead horse here with my love of PING, but it’s just a great piece of open source. Drive imaging with network and spanning support, password blanking, it’s just an excellent app.
  2. NTRegEdit – The Windows Registry editor hasn’t seen many changes over the years. NTRegEdit offers some great additional features like recursive export, color coding, improved searching, and quick edit window below the values list.
  3. Safarp – A portable alternative to appwiz.cpl (add/remove programs), it provides a few extra useful features – like silent uninstalls and repairs of Windows Installer-based apps. It also opens in a flash, unlike the clunky appwiz.
  4. WPKG – Maintaining software installs on computers in a small business environment can be a little frustrating sometimes. WPKG gives you push/pull installs and it can run as a service, so silent installs run transparently with no user ineteraction.
  1. ClamWin – Open source antivirus that does damn near everything the “big boys” do: automatic updates, scheduled scans, email scanning. There’s no realtime shield, but coupling it with the next app in the list lets ClamWin do that, too.
  2. Winpooch – Originally designed to detect activity from trojans and other spyware, Winpooch monitors program activity on your system and gives you greater control over them (like preventing an .exe from connecting to the net or writing to a system folder).
  3. Vispa
  4. Xpy – These two offer fast ways to tweak XP or Vista by turning off unwanted services and features.
  5. WCD – Its stands for Wherever Change Directory, and it’s a real timesaver for anyone that works with the Windows command prompt. All it needs is part of a directory name to change to it (wcd username to get to a user’s home folder).
  6. Angry IP Scanner – If I’m asked to inventory a location, I usually start with Angry IP. It quickly builds a list of all live hosts on a network and makes it easy to locate the addresses for devices like Wireless APs, print servers, and the like.
  7. Startup Manager – MSconfig’s startup control pane doesn’t have a lot of functionality. Startup Manager is an excellent replacement, and it’s available in a portable version as well.
  8. JKDefrag – Anything that automates system maintenance is worth a look, in my opinion. JKDefrag’s screensaver installer puts your users’ idle desktops to work for you, defragmenting whenever the .SCR kicks in.
  9. WinDirStat – Need to locate spacehogs on a user’s hard drive? Fire up WinDirStat and let it go to work and it’ll build a detailed (if not visually distracting) report of where drive space is being allocated.
  10. DeltaCopy – A fast incremental backup tool based on rsync. It supports scheduled backups and email notifications, and syncs client machines to virtual directories on a central server. I back up our point of sale history with this app – because a full copy of 1.2gb doesn’t make sense when only a few hundred kilobytes have changed in the last business day.

    Both the client and server apps are included in the 6.3mb download.

  11. EchoVNC
  12. InstantVNC – Run these two together and you’ve got a free (albeit visibly slower) version of TeamViewer. Make sure you (or your client) enters a password when launching InstantVNC, or anyone viewing the list of clients with Echo could, theoretically, take control of the machine.
  13. Putty – A fantastic portable SSH and telnet client. What else can you say about Putty?
  14. InfraRecorder – I don’t necessarily want burning software installed on all my client desktops, but I need it from time to time to do a quick backup. Since InfraRecorder is portable, I can run it from my flash drive or a network share.
  15. 7-Zip – I know 7-Zip doesn’t have the prettiest GUI, but I rarely use it from anywhere but the context menu. It works like a champ and handles all the archive types I deal with on a daily basis.
  16. FreeOTFE – If you have any sensitive data on your network, you may want to have a look at Free On The Fly Encryption. It sports an easy-to-use interface that allows the creation of virtual encrypted drives. There’s also a PDA version available to protect mobile data.
  17. QLiner Hotkeys – I love my hotkeys, and I miss them when I’m working on someone else’s system. QLiner is portable, so I can just fire it up on an unfamiliar rig and access them without missing a beat. Add in the Zip tool to archive files with a single keypress.
  18. HealthMonitor – Keep tabs on your servers (or workstations) and get email or SMS alerts when trouble’s afoot. It’ll monitor everything from ram and drive space to services and event logs.
  19. Memtest – The tool I rely on to troubleshoot RAM issues. I’ve never run a Memtest and had it miss a faulty module. If the test does’t launch or if the screen goes red, I know it’s found the problem.
  20. DBAN – Darik’s Boot and Nuke is a nice tool to keep handy if you donate old hardware. It’s available as a floppy, USB, or CD image, and will locate and securely wipe the contents of just about any hard drive. It’s even certified by the Royal Canadian Mounted Police.