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Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized software development model that encourages open collaboration.
A main principle of open-source software development is peer production, with products such as source code, blueprints, and documentation freely available to the public. The open-source movement in software began as a response to the limitations of proprietary code. The model is used for projects such as in open-source appropriate technology, and open-source drug discovery.Open source promotes universal access via an open-source or free license to a product's design or blueprint, and universal redistribution of that design or blueprint. Before the phrase open source became widely adopted, developers and producers have used a variety of other terms. Open source gained hold with the rise of the Internet. The open-source software movement arose to clarify copyright, licensing, domain, and consumer issues.
Generally, open source refers to a computer program in which the source code is available to the general public for use or modification from its original design. Code is released under the terms of a software license. Depending on the license terms, others may then download, modify, and publish their version (fork) back to the community.
Many large formal institutions have sprung up to support the development of the open-source movement, including the Apache Software Foundation, which supports community projects such as the open-source framework Apache Hadoop and the open-source HTTP server Apache HTTP.

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  1. T

    Ground Source trenches

    Hello All, newbie here. I am building a new home on a spacious plot and considering a ground source heat pump instead of air source. I understand trenches need to be 1.2m deep, 1m wide, and 5m apart. But how level does the overall site have to be? My site is on the side of a hill and the...
  2. Crossfingers

    Trying to source 28mm washer

    Hi Im about to replace pump isolator valves on my grant boiler but the 28mm valves did not come with washers and I can seem to find them to buy. Can anyone please advise where I might be able to find them? Thanks
  3. J

    plumber's unable to source leak, help, bathroom into living room

    I have a leak from the bathroom into my living room directly below. I cut the bulge and even cut a hole in the ceiling to try and locate the problem and ultimately allow the water to drain out. This has been going on for at least two weeks. I initially had a plumber out to fix the toilet cistern...
  4. C

    Good day.Chris from South Africa.

    Also have a Rothenber Rofrost Turbo pipefreezer. Worked well in the begining. Now its leaving me in the lurge. Refuses to freeze 22mm as well as 28mm copper lines. Service from Rothenberger stinks. Can't find local service agent. I won't recommend anyone buying a electric pipefreezer machine. I...
  5. A

    Samsung Air Source Heat Pump

    My ASHP has been set to 55 degrees C for the legionella in the control panel but I thought it had to be set to 60. Engineer seemed to think this is ok. I note that in 6 weeks I have had error E919 which is telling me the unit couldn't perform the correct heat for legionella thus the error code...
  6. J

    Air source heat pumps in the news again

    I'm getting so sick of the media and tories plugging ashp's like they are the solution to all our heating needs. Latest news today, £5k grant towards the cost of replacing a gas boiler with an ashp. What a joke. Every ashp system I've worked on and installed runs the heating at 40 degrees...
  7. NeetieM

    Replacing a 12 year old air source heat pump

    Hello, I hope someone can give me some advice on replacing an old air source heat pump. We moved into a shared ownership house last year which has a Daiken air source heat pump fitted to provide heating and hot water. The unit was fitted when the house was built 12 years ago. It seems that the...
  8. BuilderDan

    unpressurized open/direct UFH with buffer tank heat source

    The following is a proposed very simple installation of UFH open/direct to an existing 1000 gallon fossil fuel hot water storage tank: We are told that this won't work since the UFH pipework and pump are above the height of the tank, and therefore gravity will empty the UFH... But our...
  9. M

    URGENT Where Can I source a Duravit Cistern spare

    My cistern is in a perpetual over flow state due to the cut off valve not working. I think I have narrowed it down to the cut off arm (see photo) but where can I source a replacement?
  10. M

    Trying to source a smaller bath waste for an old cast iron bath

    Hi, can anyone advise on where to get a replacement smaller unslotted waste for an old cast iron bath please? The existing waste appears to be 1 1/4 BSP, not 1 1/2 as you'd expect. I'm including some photos of the existing installed bath waste next to a new 1 1/2 BSP waste to show the...
  11. J

    Where to source this rectangular cistern dual push

    Can anyone help with the make/model or where to source this or an alternative cistern push.
  12. R

    air source heat pump central heating

    Hi I have had a brand new and very expensive air source heat pump installed together with radiators etc (had storage heaters before). The water tank is in the airing cupboard on the first floor. I am hoping someone on this forum has experience with these systems. I have two questions. How long...
  13. J

    Source for online legal info (for trades)

    Afternoon All, I have just been removed from a job via email. Everything was going fine etc etc They have alternative contractors in and I have not been given a chance to rectify anything. They have refused to pay my invoice. Can anyone recommend some links to some online resources? Preferably...
  14. M

    What is this ... radiator grill side plate lower pipe plastic support ... .need to source new ones

    Hi all, Firstly thanks for letting me join ... I have loads of radiators with grill and side covers - 20 years old mostly. The plastic bit at the base of the side plates are now very brittle and always break when touched. - see picture. I'd like to get a load to replace the ones that are...
  15. F

    Sewage stink can not find source

    I do not know anymore.i bought a home.in spain.top floor(4rth floor) I get a horrid stink in my apartment every time thebperson Below me does Laundry. Our washers are in the kitchen. So i have taken the pipes apart and they were clean inside. The smell NEVER comes from the sink but always is...
  16. S

    Could anyone please help me source a particular toilet seat in the UK?

    Dear Community, Could anyone please help me source a particular toilet seat in the UK? Is there a UK supplier that specialises in toilet seats? Many thanks in advance for your help. The existing Valadares toilet (see 3 images attached for style of Valdares toilet I have). The measurements are...
  17. O

    Overflow likely source?

    I have a constant overflow coming from the main tank in the loft. It builds from a trickle to a pour. The isolation valve on stopcock is off. The expansion from immersion heater hangs over the tank, but is dry. This tank is highest in loft, so only source must be mains coming back up through the...
  18. B

    Servicing for Arotherm Vaillant 15KW Air Source Heat Pump (ASHP)

    Moved into a new property around 4 years ago with full 15Kw Vaillant Arotherm ASHP setup, after quite a few initial teething problems seems to run well over last couple of years. Long term just wondering if anyone can advise on servicing (in Berkshire area). Are there any independent specialist...
  19. Gasmk1

    anybody know much about the cylinders with integrated air source heat pumps

    anybody know much about the cylinders with integrated air source heat pumps
  20. C

    Air Source and underfloor heating in old bungalow

    Hello. I’m looking for some advice. We had a 1960’s bungalow in Cornwall with a wooden suspended floor. The old oil builder is 20 years old and so we want to replace it. We were looking at a Air Source Heat Pump with underfloor heating but the more we look at it the more concerned we are that it...
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