wiki: add alternatives section with SearXNG, FreshRSS, and Gitea

Add three new articles to 03-opensource/alternatives/:
- SearXNG: private metasearch, Open WebUI integration
- FreshRSS: self-hosted RSS, mobile app sync, OPML portability
- Gitea: lightweight GitHub alternative, webhook pipeline

Article count: 33 → 36. Open source section: 6 → 9.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

index.md

@@ -3,7 +3,7 @@
 > A growing reference of Linux, self-hosting, open source, streaming, and troubleshooting guides. Written by MajorLinux. Used by MajorTwin.
 >
 > **Last updated:** 2026-03-13
-> **Article count:** 33
+> **Article count:** 36
 
 ## Domains
 
@@ -11,7 +11,7 @@
 |---|---|---|
 | 🐧 Linux & Sysadmin | `01-linux/` | 9 |
 | 🏠 Self-Hosting & Homelab | `02-selfhosting/` | 8 |
-| 🔓 Open Source Tools | `03-opensource/` | 6 |
+| 🔓 Open Source Tools | `03-opensource/` | 9 |
 | 🎙️ Streaming & Podcasting | `04-streaming/` | 1 |
 | 🔧 General Troubleshooting | `05-troubleshooting/` | 9 |
 
@@ -70,6 +70,11 @@
 
 ## 🔓 Open Source Tools
 
+### Alternatives
+- [SearXNG: Private Self-Hosted Search](03-opensource/alternatives/searxng.md) — metasearch engine that queries multiple engines without exposing your identity
+- [FreshRSS: Self-Hosted RSS Reader](03-opensource/alternatives/freshrss.md) — algorithm-free feed aggregator with mobile app sync
+- [Gitea: Self-Hosted Git](03-opensource/alternatives/gitea.md) — lightweight GitHub alternative, webhooks, single Docker container
+
 ### Productivity
 - [rmlint: Duplicate File Scanning](03-opensource/productivity/rmlint-duplicate-scanning.md) — extremely fast duplicate file finding and storage reclamation
 
@@ -110,11 +115,11 @@
 
 | Date | Article | Domain |
 |---|---|---|
+| 2026-03-14 | [SearXNG: Private Self-Hosted Search](03-opensource/alternatives/searxng.md) | Open Source |
+| 2026-03-14 | [FreshRSS: Self-Hosted RSS Reader](03-opensource/alternatives/freshrss.md) | Open Source |
+| 2026-03-14 | [Gitea: Self-Hosted Git](03-opensource/alternatives/gitea.md) | Open Source |
 | 2026-03-14 | [yt-dlp: Video Downloading](03-opensource/media-creative/yt-dlp.md) | Open Source |
 | 2026-03-13 | [Vaultwarden: Self-Hosted Password Manager](03-opensource/privacy-security/vaultwarden.md) | Open Source |
-| 2026-03-13 | [tmux: Persistent Terminal Sessions](03-opensource/dev-tools/tmux.md) | Open Source |
-| 2026-03-13 | [screen: Simple Persistent Sessions](03-opensource/dev-tools/screen.md) | Open Source |
-| 2026-03-13 | [rsync: Fast, Resumable File Transfers](03-opensource/dev-tools/rsync.md) | Open Source |
 | 2026-03-13 | [Gemini CLI Manual Update](05-troubleshooting/gemini-cli-manual-update.md) | Troubleshooting |
 | 2026-03-13 | [rmlint: Duplicate File Scanning](03-opensource/productivity/rmlint-duplicate-scanning.md) | Open Source |
 | 2026-03-13 | [SnapRAID & MergerFS Storage Setup](01-linux/storage/snapraid-mergerfs-setup.md) | Linux |