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What is Sebastián Λ?
Sebastián Λ is a personal website that collects small software projects and scripts by its author, with each entry presented as a short post and a link to read more. The homepage is essentially a project index: it lists tools with a title, date, brief description, and category tags such as Software, Scripts, CSS, Angular, or Network.
The projects shown cover a practical range of developer interests:
- WebM for Lazys — a wrapper around ffmpeg and AviSynth for converting videos to WebM without using the command line, plus Gfycat integration.
- Northwind Crud — a CRUD demo for the Northwind database with an ASP.NET Web API in C# and an Angular front end.
- Dowi - Download Image — a script that adds a button for downloading images from sites like Discord, Reddit and Imgur, supporting .jpg, .jpeg, .jpe, .gif and .png.
- Cordic Graph — an explainer and project around the CORDIC algorithm for trigonometric and hyperbolic calculations, common where no hardware multiplier is available.
- Deep Dark — a flat, transparent theme for GTK 3 and GNOME Shell.
- Network Watcher — a multiplatform local-network scanner that identifies hosts, open ports and services such as HTTP, SMTP and FTP.
If you are looking for a specific tool, use the category tags and the numbered pagination at the bottom of the list to narrow down the archive.
How can I convert videos to WebM without using the command line?
Use WebM for Lazys, a small utility by Sebastián Λ that wraps ffmpeg and AviSynth so you can convert videos to WebM through a graphical interface instead of typing ffmpeg commands. It also includes Gfycat integration, which suggests the tool was aimed at people making short, shareable clips rather than archiving full-length films. You can find it on the developer's personal page: Sebastián Λ.
Who it suits
- Casual converters who have a video file and want a
.webmoutput without learning ffmpeg flags. - Clip makers producing short loops or snippets for sharing, where Gfycat-style uploads were once common.
- AviSynth users who already script video processing and want a friendlier front end.
It is a poor fit if you need batch automation, precise encoder control, or long-term maintenance, since it is a personal project published in 2020.
Practical next step
Install ffmpeg first, since the tool depends on it, then open WebM for Lazys, load your source video, and check the output before committing to a long encode. Test on a short clip: confirm audio stays in sync and that the file plays in your target browser or player.
Decision criterion
Choose this if convenience matters more than control. If you need repeatable, scriptable conversions, learn a single ffmpeg command instead — something like converting to VP9 with Opus audio — because it scales to many files and survives tool abandonment.
What is the CORDIC algorithm and how does it work?
CORDIC (Coordinate Rotation Digital Computer, also called Volder's algorithm) is a digit-by-digit method for computing trigonometric and hyperbolic functions using only addition, subtraction, bit shifts, and a small lookup table. Instead of multiplying, it rotates a vector by a sequence of fixed, precomputed angles, each chosen to shrink the remaining error—typically converging at about one bit per iteration.
The practical consequence: CORDIC is popular where a hardware multiplier is expensive or unavailable, such as simple microcontrollers and FPGAs. The trade-off is speed versus hardware cost—you spend more iterations (clock cycles) to avoid multiplier circuitry. If your target already has a fast multiplier, a polynomial approximation or a lookup table may be simpler and quicker.
For a concrete case, an FPGA hobbyist implementing a sine/cosine generator for motor control could use CORDIC to avoid instantiating DSP multiplier blocks. A desktop developer plotting the same functions would almost never need it—standard math libraries are easier and faster.
A useful next step is to trace one iteration by hand: pick a starting vector, apply the angle whose tangent is a power of two, and watch how the sign of the residual angle decides the next rotation direction. That single exercise makes the algorithm's convergence behavior obvious.
Sebastián Λ's Sebastián Λ page includes a CORDIC Graph project that visualizes the algorithm, which is a practical way to see the iteration-by-iteration rotation in action.
How do I download images from Discord, Reddit, or Imgur easily?
For a one-click downloader on those sites, the page describes Dowi – Download Image, a script that adds a button for saving images from Discord, Reddit, and Imgur, supporting .jpg, .jpeg, .jpe, .gif, and .png — see Sebastián Λ.
How to use it
- Open the project page and install the script in a userscript manager (Tampermonkey, Violentmonkey, or similar) if the project provides it as a userscript.
- Visit Discord, Reddit, or Imgur. A download button should appear near images.
- Click it to save the image directly, avoiding right-click > "Save image as…" and the extra tab-opening that some sites force.
Practical notes
- On Discord, image links often open a viewer instead of downloading; a button can bypass that extra step.
- On Reddit and Imgur, the script may only handle direct image formats, so videos, galleries, and
.webpmay not work. - Browser permission and script-manager security settings still apply; only run scripts you trust.
If you prefer not to install a script, right-click the image and choose "Save image as…", or open the image in a new tab first. For a broader tool, a download manager with browser integration can handle batches, but it is less tailored to these three sites.
What is Deep Dark and which desktop environments does it support?
Deep Dark is a flat theme with transparent elements for GTK 3 and GNOME Shell, according to Sebastián Λ. It is aimed at GTK 3–based Linux desktops, with GNOME named as the example environment.
That means it is a visual theme rather than an application: it changes the look of windows, controls and the shell, and the transparency is a deliberate part of the style. It suits someone who wants a darker, flatter desktop with some translucency and is already running a GTK 3 desktop.
A practical caveat: “GTK 3 based desktop environments like GNOME” is broad, but themes often depend on the exact GNOME Shell version and on whether your distribution uses GTK 3 or GTK 4 apps. Before installing, check the theme’s own page for the supported GTK and GNOME Shell versions, and test it on your setup rather than assuming it will apply consistently everywhere.
If you use GNOME, start by confirming your GNOME Shell version, then look at the project page for installation notes; if you use another GTK 3 desktop, expect the window theme to apply but the shell styling may not.
How can I scan my local network for open ports and services?
For a quick local-network inventory, start with a tool that combines host discovery, port scanning and service checks rather than running separate commands for each step.
Sebastián Λ's Network Watcher is described as a multiplatform application that scans the local network, identifies hosts and their open ports, and verifies services such as HTTP, SMTP and FTP. That combination is the practical draw: one pass gives you a host list, port state and a hint about what each service is, which is usually enough for a home or small-office audit. See Sebastián Λ.
What to check in any scanner
- Host discovery first, so you scan only live devices instead of sweeping dead addresses.
- Port range control, so you can limit a quick scan to common ports or widen it deliberately.
- Service detection, which distinguishes an open port from an actual HTTP, SMTP or FTP service.
- Output you can save or compare, useful for spotting new devices later.
Trade-offs
Broad scans are slow and noisy; narrow scans miss services on unusual ports. Service probes are more informative but take longer than a bare port check. On your own network this is routine administration; on networks you do not control, scanning without permission can violate policy or law.
Next step: run a discovery-only pass to list hosts, then scan common ports on those hosts and finally enable service detection on the few addresses that matter. Compare the result with your router's client list to confirm nothing unexpected is connected.
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