《XCircuit》是開放源碼計劃的免費線路繪圖軟體。 除了可畫出高品質的線路圖（PostScript格式）供出版用以外，程式可產生供SPICE用的線路網清單（netlist）。
　　啟動之后發現界面很象一個畫圖軟件,工具欄右邊發現有一個圖標,點擊就看到元件了,就可以拖出來畫圖了....可以保存成eps格式的,直接插入tex就好了,質量號稱是出版級的。

　　XCircuit is a UNIX/X11 (and now Windows, if you have an X-Server running) program for drawing publishable-quality electrical circuit schematic diagrams and related figures, and produce circuit netlists through schematic capture. XCircuit regards circuits as inherently hierarchical, and writes both hierarchical PostScript output and hierarchical SPICE netlists. Circuit components are saved in and retrieved from libraries which are fully editable. XCircuit does not separate artistic expression from circuit drawing; it maintains flexiblity in style without compromising the power of schematic capture.

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圖是XCircuit啟動后之使用介面圖,在 XCircuit 介面之最上方是基本操作選單如檔案 (File),編輯 (Edit),文字 (Text),選項 (Options),視窗 (Window) 與網表 (Netlist) 等,而在此介面之最右側為基本工具圖示如繪制矩形 (draw box),繪制弧形 (draw arc) ... 等.至於在 XCircuit 介面之最下方則是一些編輯 態之 位,接下我們將針對基本工具進詳細之明.

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